Peptide
Melanotan II
Also known as
MT2 · MT-II · Melanotan 2 · Melanotan-II · MT-2 · MT II · Barbie drug · tan jab · Ac-Nle-c[Asp-His-D-Phe-Arg-Trp-Lys]-NH2 · Ac-Nle4-Asp5-His6-D-Phe7-Arg8-Trp9-Lys10-α-MSH4-10-NH2
Community talk. May contain inaccuracies. Not medical advice. Not a protocol. Not for human or animal use.
What it is
| Identity | MT2 is a synthetic tanning peptide that mimics a pigmentation hormone. It can also affect appetite and sexual response. |
|---|---|
| Forms and relatives | Injection and nasal-spray accounts differ. Melanotan I and PT-141 are related compounds with different goals and dose traditions, rather than interchangeable forms of MT2. |
Notes
Melanotan II (MT2) is a synthetic tanning peptide discussed for darker skin, with appetite and sexual effects that some people want and others find troublesome. Injection and nasal-spray accounts differ. A better tan can come with nausea, uneven pigment and darker freckles or moles.
A pigment signal, not a cosmetic stain. MT2 mimics alpha-MSH, a hormone involved in pigmentation. It acts throughout the body rather than coloring the skin surface like a spray tan. The same compound can affect appetite and sexual response. Evaluation of melanotan-II in a pilot phase-I clinical study (Official context · Accessed 2026-09-30) · Melanotan II injection resulting in systemic toxicity and rhabdomyolysis (Official context · Accessed 2026-09-30)
Injections and nasal sprays are different forms. The opened tanning logs describe injections; the established research route was subcutaneous, meaning under the skin. Nasal users value convenience, but disagree about effectiveness and delivered amount. Neither account establishes an oral-pill equivalent. Evaluation of melanotan-II in a pilot phase-I clinical study (Official context · Accessed 2026-09-30) · Nasals vs pinning (Personal report · Accessed 2026-09-30) · Trial dosage for nasal (Personal report · Accessed 2026-09-30)
Related names do not mean interchangeable products. The original discussion contrasts MT2 with Melanotan I for pigment-focused use and PT-141 for arousal without intentionally building a tan. Those comparisons do not establish equivalent doses or make stacking melanocortins a checked combination.
Source context — Evaluation of melanotan-II in a pilot phase-I clinical study: Abstract only; no numerical human plasma half-life reported. Small male research cohort, not modern community product.
Source context — Melanotan II injection resulting in systemic toxicity and rhabdomyolysis: Single case and abstract access only. Does not establish safety of smaller amounts or risk frequency.
Source context — Nasals vs pinning: No amounts or standardized formulation; preference does not establish equivalent absorption.
Source context — Trial dosage for nasal: Uncontrolled self-experiment called a trial in the thread; not a clinical trial. Subsequent injection amount unstated. No dose conversion inferred.
What people notice
| Darker color | Positive logs describe a stronger tan after two or three weeks with UV exposure. Other users notice little extra tan while freckles and spots get darker. |
|---|---|
| Sexual effects | Some describe spontaneous erections or arousal; another tanning user noticed no libido change. These effects can be welcome or intrusive. |
| Appetite | Reduced hunger appears in cutting accounts. Diets, GLP-1 drugs and stimulants complicate claims of lasting weight loss. |
Notes
Darker color, sometimes after years of barely tanning. Original_Bake_3972 described an unusually strong tan by three weeks, with small arm freckles. InformationFar2428 reported color after two weeks. Both also used UV; their accounts cannot isolate MT2’s contribution. 3 weeks on MT2 (Personal report · Accessed 2026-09-30) · MT2 2 weeks of 250mcg nightly followed by natural sun (Personal report · Accessed 2026-09-30)
More freckles, less tan is a real disagreement with success stories. The two-week low-response author reduced from 300 to 200 mcg after spots became too dark. jonoyeaaa’s interrupted course also produced a poor cosmetic tradeoff. Higher exposure is not a reliable fix for dissatisfaction. 2 weeks on melanotan2 and no difference (Personal report · Accessed 2026-09-30) · Change up of doseage advice. (Personal report · Accessed 2026-09-30)
Sexual effects are variable and can be intrusive. Mountain_Wall_3258 described spontaneous erections after bedtime use. InformationFar2428 noticed no libido change at the stated tanning amount, while another commenter reported arousal after 1 mg. A tan response does not predict sexual response. 3 weeks on MT2 (Personal report · Accessed 2026-09-30) · MT2 2 weeks of 250mcg nightly followed by natural sun (Personal report · Accessed 2026-09-30)
Lower appetite can be welcome or unwanted. The original accounts link reduced hunger with cutting or easier calorie control. They do not establish lasting weight loss; concurrent diets, GLP-1 drugs and stimulants muddy the attribution.
Source context — 3 weeks on MT2: Anonymous product identity and uncontrolled UV. Text inspected; linked photograph not independently assessed. Different commenters are not one composite user.
Source context — MT2 2 weeks of 250mcg nightly followed by natural sun: Title and later reply differ; not corrected into a single schedule. Unverified product and UV exposure; no efficacy or prevalence estimate.
Source context — 2 weeks on melanotan2 and no difference: Self-described skin types; UV and changing amounts confound comparison. Dangerous joke replies and UV prescriptions excluded.
Source context — Change up of doseage advice.: Anonymous uncontrolled account. First injection reportedly tanned well; later little tan is not total nonresponse. Commenters’ causal freckle/UV explanations are untested.
Doses people talk about
| Injection amounts | 100–250 mcg per administration appears in individual logs. Separate loading charts give 250–500 mcg under the skin (SubQ) daily or every other day; these are not one standard progression. |
|---|---|
| Maintenance injections | Older charts give 100–500 mcg once or twice weekly or less. One author's title says 250 mcg once or twice weekly, while a later reply says 500 mcg two or three times weekly. |
| Sexual-use comparisons | Separate as-needed SubQ lore gives 0.5–1 mg or 0.5–1.5 mg. These are different from tanning loads and do not establish a safe range. |
| Nasal example | One user states 1 mg daily for ten days with little extra color. Labeled milligrams or spray counts do not establish absorbed dose or an injection equivalent. |
Notes
Injection reports: 100–250 mcg per administration. One three-week log used 100 mcg daily for seven days, 250 mcg every two days in week two, then 250 mcg weekly. Another used 250 mcg nightly for two weeks. These are separate reported courses, not an escalation plan. 3 weeks on MT2 (Personal report · Accessed 2026-09-30) · MT2 2 weeks of 250mcg nightly followed by natural sun (Personal report · Accessed 2026-09-30)
Original loading charts: 250–500 mcg per SC administration. The preserved charts describe daily or every-other-day use. One commenter separately reported 250 mcg daily for a week, then 500 mcg for another. A circulated chart and an individual's account provide different kinds of information; neither establishes a standard schedule. Change up of doseage advice. (Personal report · Accessed 2026-09-30)
Maintenance is also variable. Original records describe 100–500 mcg per injection once or twice weekly or less. One author's thread title says 250 mcg once or twice weekly, but a later reply says 500 mcg two to three times weekly. The title and reply describe different schedules and should not be combined into one account. MT2 2 weeks of 250mcg nightly followed by natural sun (Personal report · Accessed 2026-09-30)
Sexual-use lore: 0.5–1 mg; a later 0.5–1.5 mg summary. The original record gives these as separate SC as-needed comparison claims. They are distinct from tanning loads and do not establish a safe range. A newly opened 1 mg arousal comment supplies an individual example. MT2 2 weeks of 250mcg nightly followed by natural sun (Personal report · Accessed 2026-09-30)
Nasal: one stated 1 mg daily account. Bobajob-365 reported little extra color after ten days alongside tanning-booth use. The subsequent injection amount was not stated. Spray counts and labeled milligrams do not establish absorbed dose or an injection equivalent. Trial dosage for nasal (Personal report · Accessed 2026-09-30)
Source context — 3 weeks on MT2: Anonymous product identity and uncontrolled UV. Text inspected; linked photograph not independently assessed. Different commenters are not one composite user.
Source context — MT2 2 weeks of 250mcg nightly followed by natural sun: Title and later reply differ; not corrected into a single schedule. Unverified product and UV exposure; no efficacy or prevalence estimate.
Source context — Change up of doseage advice.: Anonymous uncontrolled account. First injection reportedly tanned well; later little tan is not total nonresponse. Commenters’ causal freckle/UV explanations are untested.
Source context — Trial dosage for nasal: Uncontrolled self-experiment called a trial in the thread; not a clinical trial. Subsequent injection amount unstated. No dose conversion inferred.
Half-life, onset & duration
| Felt onset | Injection nausea starts within minutes in some accounts. Visible color took two to three weeks in positive logs, at least a month in another, and remained disappointing for some. |
|---|---|
| Felt duration | Some describe injection side effects lasting 20–60 minutes. One account gives about an hour of flushing and intermittent erections across six hours, rather than one continuous erection; color can fade over weeks or months. |
| Half-life | Claims of one hour, about three hours or 30–36 hours conflict, without a human plasma measurement in these threads. Persistent tan cannot settle peptide clearance. |
Notes
Acute injection effects: minutes in some reports. One commenter noticed nausea after 3–5 minutes; others describe 1–8 or 5–10 minutes. The original record’s 30–90-minute nausea peak is a separate unlinked summary, not a measured blood peak or universal onset. Just took my first dose… anything to look out for? (Community discussion · Accessed 2026-09-30)
Visible tan: two to three weeks in positive logs; a month in another. The three-week and nightly logs reported color, while a two-week near-daily 100–250 mcg user noticed little beyond their usual tan. A type-I commenter needed at least a month. Freckles can change before the desired overall color. 3 weeks on MT2 (Personal report · Accessed 2026-09-30) · MT2 2 weeks of 250mcg nightly followed by natural sun (Personal report · Accessed 2026-09-30) · 2 weeks on melanotan2 and no difference (Personal report · Accessed 2026-09-30) · Change up of doseage advice. (Personal report · Accessed 2026-09-30)
Acute effects do not share one clock. Comments describe 20–40 or 45–60 minutes of injection sides; Mountain_Wall_3258 described about an hour of flushing and intermittent erections over roughly six daytime hours. These are personal windows, not continuous erection duration or bodily clearance. Just took my first dose… anything to look out for? (Community discussion · Accessed 2026-09-30) · 3 weeks on MT2 (Personal report · Accessed 2026-09-30)
Color may linger for weeks or months. The original record describes general fading over weeks and slower freckle/mole fading. One commenter remained darker during about four months off annually; another simply claimed several months. Continued UV, baseline skin and subjective comparison remain confounders. Melanotan in your system (Community discussion · Accessed 2026-09-30)
1 hour, about 3 hours, and 30–36 hours are conflicting claims. The “Halflife” thread contrasts 1 and 33 hours; replies favor 3 or repeat 36. Another thread repeats 30. None supplies a human plasma measurement. A 4–5-day guess also appears, without supporting evidence. Halflife (Community discussion · Accessed 2026-09-30) · Melanotan in your system (Community discussion · Accessed 2026-09-30)
No verified human number emerges from these threads. These are circulated estimates, not a measured range. Seeing darker skin the next day cannot choose between them, and tan persistence is not evidence that the parent peptide remains in the bloodstream. Halflife (Community discussion · Accessed 2026-09-30) · Melanotan in your system (Community discussion · Accessed 2026-09-30)
Source context — Just took my first dose… anything to look out for?: Not a timing study; unstated amounts in several replies. No-nausea fake-product claim rejected. Antihistamine instructions excluded.
Source context — 3 weeks on MT2: Anonymous product identity and uncontrolled UV. Text inspected; linked photograph not independently assessed. Different commenters are not one composite user.
Source context — MT2 2 weeks of 250mcg nightly followed by natural sun: Title and later reply differ; not corrected into a single schedule. Unverified product and UV exposure; no efficacy or prevalence estimate.
Source context — 2 weeks on melanotan2 and no difference: Self-described skin types; UV and changing amounts confound comparison. Dangerous joke replies and UV prescriptions excluded.
Source context — Change up of doseage advice.: Anonymous uncontrolled account. First injection reportedly tanned well; later little tan is not total nonresponse. Commenters’ causal freckle/UV explanations are untested.
Source context — Melanotan in your system: Persistence self-report and secondhand claim have different evidence roles; UV, skin turnover and ongoing habits not controlled.
Source context — Halflife: Hearsay and opinions, no inspected human PK measurement. No scientific claim origin established by these comments.
Cycles people discuss
| Load then less frequent use | Charts describe daily or alternate-day loading for 7–14 days, sometimes 2–4+ weeks, then maintenance. One log used 100 mcg daily week one, 250 mcg every two days week two, then 250 mcg weekly. |
|---|---|
| Seasonal breaks | Holiday, competition and seasonal runs appear. One person reports about four months off annually; other break claims differ, with no validated washout or safety guarantee. |
Notes
Daily or every-other-day loading, then less frequent use. Original summaries describe roughly 7–14 days, sometimes 2–4+ weeks, with seasonal, holiday or competition runs. The opened courses fit that general pattern, but they do not define a standard course or safe cumulative exposure. 3 weeks on MT2 (Personal report · Accessed 2026-09-30)
Injection reports: 100–250 mcg per administration. One three-week log used 100 mcg daily for seven days, 250 mcg every two days in week two, then 250 mcg weekly. Another used 250 mcg nightly for two weeks. These are separate reported courses, not an escalation plan. 3 weeks on MT2 (Personal report · Accessed 2026-09-30) · MT2 2 weeks of 250mcg nightly followed by natural sun (Personal report · Accessed 2026-09-30)
Loading and break lengths are disputed. The original record retains months-long washout suggestions and shorter seasonal reruns, without a validated interval or hormonal post-cycle-therapy pattern. “Melanotan in your system” contains one four-month annual break. No evidence here makes either approach a safety guarantee. Melanotan in your system (Community discussion · Accessed 2026-09-30)
Source context — 3 weeks on MT2: Anonymous product identity and uncontrolled UV. Text inspected; linked photograph not independently assessed. Different commenters are not one composite user.
Source context — MT2 2 weeks of 250mcg nightly followed by natural sun: Title and later reply differ; not corrected into a single schedule. Unverified product and UV exposure; no efficacy or prevalence estimate.
Source context — Melanotan in your system: Persistence self-report and secondhand claim have different evidence roles; UV, skin turnover and ongoing habits not controlled.
Stacks
| UV exposure | Sun or tanning-bed use accompanies many tanning reports. Their exposure minutes describe what users did, without establishing safe UV limits or sunscreen replacement. |
|---|---|
| Cutting combinations | Calorie deficits, GLP-1 drugs and stimulants appear alongside appetite effects. Glutathione also appears in aesthetic discussions without an established MT2 synergy. |
| PT-141 comparisons | People discuss switching to PT-141 for arousal without intentionally adding more tan. That is a comparison or switch, rather than evidence for combining both melanocortins. |
Notes
Darker color, sometimes after years of barely tanning. Original_Bake_3972 described an unusually strong tan by three weeks, with small arm freckles. InformationFar2428 reported color after two weeks. Both also used UV; their accounts cannot isolate MT2’s contribution. 3 weeks on MT2 (Personal report · Accessed 2026-09-30) · MT2 2 weeks of 250mcg nightly followed by natural sun (Personal report · Accessed 2026-09-30)
A darker tan does not replace sunscreen. TGA warns that pigmentation does not replace sunscreen and flags serious skin-cancer risk. Sunbed or outdoor minutes from logs describe exposure, not safe exposure limits; favorable tan anecdotes cannot establish cancer protection. Don’t risk using tanning products containing melanotan (Official context · Accessed 2026-09-30)
UV co-factor (main “stack”): Short controlled sun or tanning-bed UV is treated as the primary amplifier of visible color; common talk is brief exposures (often ~10–20 minutes class in guides) after tolerance is known — not unlimited burning. [community]
Lower appetite can be welcome or unwanted. The original accounts link reduced hunger with cutting or easier calorie control. They do not establish lasting weight loss; concurrent diets, GLP-1 drugs and stimulants muddy the attribution.
Fat-loss adjacency: Appetite drop leads to concurrent calorie-deficit, GLP-1, or stimulant talk — effects are confounded and not a formal synergy protocol. [community]
Skin-tone adjacency mentions: Glutathione or other “tone” products appear in aesthetic forums but are separate mechanisms, not evidence-based MT-II pairs. [community]
Related names do not mean interchangeable products. The original discussion contrasts MT2 with Melanotan I for pigment-focused use and PT-141 for arousal without intentionally building a tan. Those comparisons do not establish equivalent doses or make stacking melanocortins a checked combination.
PT-141 instead (not usually with): For pure desire/arousal without intentional tanning, threads point to PT-141/bremelanotide rather than stacking both melanocortins casually (overlap of nausea, BP, and residual pigment risk). [community]
2025–26 switch, not stack: After a tan load, people who still want the bedroom effect without more pigment talk PT-141 — not MT-II + PT-141 together. [community]
Source context — 3 weeks on MT2: Anonymous product identity and uncontrolled UV. Text inspected; linked photograph not independently assessed. Different commenters are not one composite user.
Source context — MT2 2 weeks of 250mcg nightly followed by natural sun: Title and later reply differ; not corrected into a single schedule. Unverified product and UV exposure; no efficacy or prevalence estimate.
Source context — Don’t risk using tanning products containing melanotan: Australian regulatory context; reported severe events do not prove their frequency or individual causation.
Watch for
| Freckles and moles | Spots can darken or multiply before the desired tan. New, enlarging or changing lesions warrant professional assessment; more UV is not a way to establish their safety. |
|---|---|
| Persistent erection | An erection lasting more than 3–4 hours needs emergency assessment. A published melanotan case required hospital treatment and had unrecovered erectile function at four-week follow-up. |
| Nausea and hidden risks | Nausea, flushing, fatigue and reflux occur. TGA also reports kidney dysfunction and brain swelling; a strong tan or absence of nausea cannot verify product contents, safety or cancer protection. |
Notes
Freckles and moles can become the unwanted result. jonoyeaaa stopped for a week after freckles multiplied, then reported little tan and more freckles with 100 mcg daily for three days. New, enlarging or changing lesions warrant professional assessment, rather than more UV to “even them out.” Change up of doseage advice. (Personal report · Accessed 2026-09-30) · Don’t risk using tanning products containing melanotan (Official context · Accessed 2026-09-30)
Visible tan: two to three weeks in positive logs; a month in another. The three-week and nightly logs reported color, while a two-week near-daily 100–250 mcg user noticed little beyond their usual tan. A type-I commenter needed at least a month. Freckles can change before the desired overall color. 3 weeks on MT2 (Personal report · Accessed 2026-09-30) · MT2 2 weeks of 250mcg nightly followed by natural sun (Personal report · Accessed 2026-09-30) · 2 weeks on melanotan2 and no difference (Personal report · Accessed 2026-09-30) · Change up of doseage advice. (Personal report · Accessed 2026-09-30)
Persistent erection is an emergency. NHS advises emergency care for an erection lasting more than 3–4 hours. A published melanotan case required hospital treatment and reported unrecovered erectile function at four weeks; intermittent erection anecdotes are not reassurance. Priapism (painful erections) (Official context · Accessed 2026-09-30) · Melanotan-induced priapism: a hard-earned tan (Official context · Accessed 2026-09-30)
No nausea does not verify purity; nausea does not verify potency. The nightly thread includes both intense nausea at 100 mcg and strong color without reported side effects. Neither sensation authenticates a product. TGA reports kidney dysfunction and brain swelling with MT2, alongside concerns about unassessed tanning products. MT2 2 weeks of 250mcg nightly followed by natural sun (Personal report · Accessed 2026-09-30) · Don’t risk using tanning products containing melanotan (Official context · Accessed 2026-09-30)
A darker tan does not replace sunscreen. TGA warns that pigmentation does not replace sunscreen and flags serious skin-cancer risk. Sunbed or outdoor minutes from logs describe exposure, not safe exposure limits; favorable tan anecdotes cannot establish cancer protection. Don’t risk using tanning products containing melanotan (Official context · Accessed 2026-09-30)
Bedtime is a coping habit, not proof that nausea resolves. One nightly user found it helpful, but another forum author woke with reflux. People report fatigue, flushing and yawning too. The absence of bothersome symptoms in a favorable log does not screen for unseen harm. MT2 2 weeks of 250mcg nightly followed by natural sun (Personal report · Accessed 2026-09-30) · Melanotan II and nausea (Personal report · Accessed 2026-09-30) · Just took my first dose… anything to look out for? (Community discussion · Accessed 2026-09-30)
Source context — Change up of doseage advice.: Anonymous uncontrolled account. First injection reportedly tanned well; later little tan is not total nonresponse. Commenters’ causal freckle/UV explanations are untested.
Source context — Don’t risk using tanning products containing melanotan: Australian regulatory context; reported severe events do not prove their frequency or individual causation.
Source context — 3 weeks on MT2: Anonymous product identity and uncontrolled UV. Text inspected; linked photograph not independently assessed. Different commenters are not one composite user.
Source context — MT2 2 weeks of 250mcg nightly followed by natural sun: Title and later reply differ; not corrected into a single schedule. Unverified product and UV exposure; no efficacy or prevalence estimate.
Source context — 2 weeks on melanotan2 and no difference: Self-described skin types; UV and changing amounts confound comparison. Dangerous joke replies and UV prescriptions excluded.
Source context — Priapism (painful erections): General priapism guidance, not an MT2-specific incidence study.
Source context — Melanotan-induced priapism: a hard-earned tan: Single case, abstract only; PMC full body blocked by reCAPTCHA. No prevalence estimate.
Source context — Melanotan II and nausea: Thread starter has commercial board-representative role; steroid/PDE5 co-use confounds sexual reports. Syringe ticks not converted to mcg; ethnic/racial language and drug-management recipes excluded.
Source context — Just took my first dose… anything to look out for?: Not a timing study; unstated amounts in several replies. No-nausea fake-product claim rejected. Antihistamine instructions excluded.
Full notes
Melanotan II (MT2) is a synthetic tanning peptide discussed for darker skin, with appetite and sexual effects that some people want and others find troublesome. Injection and nasal-spray accounts differ. A better tan can come with nausea, uneven pigment and darker freckles or moles.
What it is and why people look it up
- A pigment signal, not a cosmetic stain. MT2 mimics alpha-MSH, a hormone involved in pigmentation. It acts throughout the body rather than coloring the skin surface like a spray tan. The same compound can affect appetite and sexual response. Official context Official context Community
- Injections and nasal sprays are different forms. The opened tanning logs describe injections; the established research route was subcutaneous, meaning under the skin. Nasal users value convenience, but disagree about effectiveness and delivered amount. Neither account establishes an oral-pill equivalent. Official context Personal report Personal report
- Related names do not mean interchangeable products. The original discussion contrasts MT2 with Melanotan I for pigment-focused use and PT-141 for arousal without intentionally building a tan. Those comparisons do not establish equivalent doses or make stacking melanocortins a checked combination. Community
Benefits people seek and how it may feel
- Darker color, sometimes after years of barely tanning. Original_Bake_3972 described an unusually strong tan by three weeks, with small arm freckles. InformationFar2428 reported color after two weeks. Both also used UV; their accounts cannot isolate MT2’s contribution. Personal report Personal report
- Sexual effects are variable and can be intrusive. Mountain_Wall_3258 described spontaneous erections after bedtime use. InformationFar2428 noticed no libido change at the stated tanning amount, while another commenter reported arousal after 1 mg. A tan response does not predict sexual response. Personal report Personal report
- Lower appetite can be welcome or unwanted. The original accounts link reduced hunger with cutting or easier calorie control. They do not establish lasting weight loss; concurrent diets, GLP-1 drugs and stimulants muddy the attribution. Community
Doses people discuss
- Injection reports: 100–250 mcg per administration. One three-week log used 100 mcg daily for seven days, 250 mcg every two days in week two, then 250 mcg weekly. Another used 250 mcg nightly for two weeks. These are separate reported courses, not an escalation plan. Personal report Personal report
- Original loading charts: 250–500 mcg per SC administration. The preserved charts describe daily or every-other-day use. One commenter separately reported 250 mcg daily for a week, then 500 mcg for another. A circulated chart and an individual's account provide different kinds of information; neither establishes a standard schedule. Community Personal report
- Sexual-use lore: 0.5–1 mg; a later 0.5–1.5 mg summary. The original record gives these as separate SC as-needed comparison claims. They are distinct from tanning loads and do not establish a safe range. A newly opened 1 mg arousal comment supplies an individual example. Community Personal report
- Nasal: one stated 1 mg daily account. Bobajob-365 reported little extra color after ten days alongside tanning-booth use. The subsequent injection amount was not stated. Spray counts and labeled milligrams do not establish absorbed dose or an injection equivalent. Personal report
- Maintenance is also variable. Original records describe 100–500 mcg per injection once or twice weekly or less. One author's thread title says 250 mcg once or twice weekly, but a later reply says 500 mcg two to three times weekly. The title and reply describe different schedules and should not be combined into one account. Community Personal report
Half-life claims circulating in the community
- 1 hour, about 3 hours, and 30–36 hours are conflicting claims. The “Halflife” thread contrasts 1 and 33 hours; replies favor 3 or repeat 36. Another thread repeats 30. None supplies a human plasma measurement. A 4–5-day guess also appears, without supporting evidence. Reddit r/Melanotan2 Reddit r/Melanotan2
- No verified human number emerges from these threads. These are circulated estimates, not a measured range. Seeing darker skin the next day cannot choose between them, and tan persistence is not evidence that the parent peptide remains in the bloodstream. Reddit r/Melanotan2 Reddit r/Melanotan2
When people notice a change
- Acute injection effects: minutes in some reports. One commenter noticed nausea after 3–5 minutes; others describe 1–8 or 5–10 minutes. The original record’s 30–90-minute nausea peak is a separate unlinked summary, not a measured blood peak or universal onset. Reddit r/Melanotan2 Community
- Visible tan: two to three weeks in positive logs; a month in another. The three-week and nightly logs reported color, while a two-week near-daily 100–250 mcg user noticed little beyond their usual tan. A type-I commenter needed at least a month. Freckles can change before the desired overall color. Personal report Personal report Personal report Personal report
How long the effects and color may last
- Acute effects do not share one clock. Comments describe 20–40 or 45–60 minutes of injection sides; Mountain_Wall_3258 described about an hour of flushing and intermittent erections over roughly six daytime hours. These are personal windows, not continuous erection duration or bodily clearance. Reddit r/Melanotan2 Personal report
- Color may linger for weeks or months. The original record describes general fading over weeks and slower freckle/mole fading. One commenter remained darker during about four months off annually; another simply claimed several months. Continued UV, baseline skin and subjective comparison remain confounders. Community Reddit r/Melanotan2
Courses, maintenance and breaks
- Daily or every-other-day loading, then less frequent use. Original summaries describe roughly 7–14 days, sometimes 2–4+ weeks, with seasonal, holiday or competition runs. The opened courses fit that general pattern, but they do not define a standard course or safe cumulative exposure. Community Community Personal report
- Loading and break lengths are disputed. The original record retains months-long washout suggestions and shorter seasonal reruns, without a validated interval or hormonal post-cycle-therapy pattern. “Melanotan in your system” contains one four-month annual break. No evidence here makes either approach a safety guarantee. Community Reddit r/Melanotan2
What to watch for
- Freckles and moles can become the unwanted result. jonoyeaaa stopped for a week after freckles multiplied, then reported little tan and more freckles with 100 mcg daily for three days. New, enlarging or changing lesions warrant professional assessment, rather than more UV to “even them out.” Personal report Official context
- No nausea does not verify purity; nausea does not verify potency. The nightly thread includes both intense nausea at 100 mcg and strong color without reported side effects. Neither sensation authenticates a product. TGA reports kidney dysfunction and brain swelling with MT2, alongside concerns about unassessed tanning products. Personal report Official context
- Persistent erection is an emergency. NHS advises emergency care for an erection lasting more than 3–4 hours. A published melanotan case required hospital treatment and reported unrecovered erectile function at four weeks; intermittent erection anecdotes are not reassurance. Official context Official context
- A darker tan does not replace sunscreen. TGA warns that pigmentation does not replace sunscreen and flags serious skin-cancer risk. Sunbed or outdoor minutes from logs describe exposure, not safe exposure limits; favorable tan anecdotes cannot establish cancer protection. Official context
Supporting research context
- Historical trial amounts are a different context. Dorr’s three-man pilot started at 0.01 mg/kg SC and escalated to 0.025–0.03 mg/kg; intermittent erections lasted 1–5 hours. Wessells used 0.025 mg/kg in ten men with erectile dysfunction. Neither supplies the missing human half-life. Official context Official context
- A vial label is not an assay. A 2014 analysis found 4.32–8.84 mg in products labeled 10 mg. A separate case described systemic toxicity and muscle breakdown after 6 mg SC. These findings neither characterize every current product nor establish safety below that amount. Official context Official context
- Rat kinetics cannot answer the human question. The rat-IV study used 0.3 mg/kg and found biphasic disposition with assay-dependent half-life estimates. Its abstract does not give the numerical half-life; it cannot validate the hour or multi-day forum claims. Animal context
From community discussion
- More freckles, less tan is a real disagreement with success stories. The two-week low-response author reduced from 300 to 200 mcg after spots became too dark. jonoyeaaa’s interrupted course also produced a poor cosmetic tradeoff. Higher exposure is not a reliable fix for dissatisfaction. Personal report Personal report
- Bedtime is a coping habit, not proof that nausea resolves. One nightly user found it helpful, but another forum author woke with reflux. People report fatigue, flushing and yawning too. The absence of bothersome symptoms in a favorable log does not screen for unseen harm. Personal report Personal report Reddit r/Melanotan2
- Nasal convenience versus uncertain response. No-Potential-8386 preferred nasal use, reporting similar effectiveness and fewer injection-site dark spots, but harder dose regulation. Bobajob-365 reported no extra tan before switching. Original 30–40% absorption and 2–3× exposure claims remain unverified secondary lore, not a conversion rule. Personal report Personal report Community
- Seasonal totals and combination claims need their own limits. Original chart lore contrasts 20–50 mg cumulative for very fair skin with under 10 mg for darker types; it is not a target. UV habits, hair darkening, uneven facial color and PT-141 switches recur in the preserved account, without proving a predictable result or safe combination. Community Community