Non-peptide

Methenolone

Also known as

Primobolan · Primo · Primobolan Depot · methenolone enanthate · methenolone acetate

Community talk. May contain inaccuracies. Not medical advice. Not a protocol. Not for human or animal use.

What it is

Primo or Primobolan	An anabolic steroid discussed for gradual muscle gains, fullness and a less watery appearance.
Two forms	Depot usually means enanthate in an intramuscular oil injection; oral Primobolan contains acetate. Oral and injected milligrams are not interchangeable.

Notes

Methenolone, usually called Primo or Primobolan, is an anabolic steroid discussed for gradual muscle gains and a fuller, less watery physique. Reports range from better training and well-being to little obvious benefit. Its mild reputation does not remove hormonal, hair-loss or injection risks.

Injectable enanthate and oral acetate are different forms. Primobolan Depot usually means methenolone enanthate in an oil-based intramuscular injection. Oral Primobolan contains the acetate form. This is a steroid rather than a peptide needing reconstitution; oral and injected milligrams are not interchangeable. Most of the accounts below concern injections.

What people notice

Fuller appearance	One mixed-cycle user described fuller shoulders/traps and more visible veins while feeling almost unchanged. This does not isolate Primo from testosterone and DHB.
Training response varies	Some report better strength, recovery or well-being; another noticed little gym benefit and felt weaker or flatter during part of a mixed cycle.
Incomplete payoff	A woman's ten-week log included early fatigue and no strength change, later Anavar use and some progress, but still fell short of expectations.

Notes

A fuller look without a dramatic sensation. sickunt93 described fuller shoulders and traps and more visible veins while feeling almost unchanged. Their photographed cutting cycle also included testosterone and DHB. They liked the appearance but could not judge a full bulking course; cost ended a later 500-mg run after six weeks. r/steroids: Compounds — Primobolan, October 2022 (Community discussion · Accessed 2026-09-30)

Better strength, recovery or well-being for some. DoYouEvenDoubleLeg's week-15 report favored a Primo-containing cycle over previous testosterone-only use. It also included early Dianabol and isotretinoin, severe initial injection pain, initial sleep difficulty and a cholesterol concern. The author blamed isotretinoin for cholesterol; that attribution was not established. r/steroids: Compounds — Primobolan, October 2022 (Community discussion · Accessed 2026-09-30)

Little added benefit is a real outcome. stanozolololol reported becoming weaker and flatter during an initial combination, then subtle cosmetic changes during higher-testosterone use but no gym benefit they could separate from testosterone, growth hormone and insulin. Irritation and scalp discomfort reduced the appeal. Another satisfied 16-week user still reported intermittent prostate complaints. r/steroids: Methenolone experience thread, December 2021 (Community discussion · Accessed 2026-09-30)

The women's log had a rough start and an incomplete payoff. sleepy_sushi_ described fatigue and no strength change by week four, improving energy around week six, then later Anavar use and some lifting progress. Added birth-control pills alongside Nexplanon complicated the timeline. At ten weeks the experience still fell short of expectations; a scratchy throat and later replies about voice changes temper the mild label. r/steroidsxx: First Primo Cycle Experience and Report (Community discussion · Accessed 2026-09-30)

Source context — r/steroids: Compounds — Primobolan, October 2022: Mixed compounds, diet and training; self-reported laboratory results and product testing; no verified denominator or comparator. Severe shedding and subsequent easing are one person's timeline. Not all collapsed replies were inspected.

Source context — r/steroids: Methenolone experience thread, December 2021: Self-reports with several drugs and no isolated comparator. Grami does not establish cause, ester clearance or persistent gains. Initial stanozolololol quantity lacks a clear per-week unit, so it is not projected into dose numbers.

Source context — r/steroidsxx: First Primo Cycle Experience and Report: OP has Nexplanon plus added oral contraception, later Anavar and changing amounts; the OP and voice-change reply are distinct people. Improvement around week six cannot be assigned to Primo alone. Planned next course is not a proven repeat interval.

Doses people talk about

Male enanthate discussion	400–600 mg/week, with some 300 mg/week reports, is the older band. A separate lower account used 200 mg/week alongside testosterone.
Another injection account	110 mg every 3.5 days, totaling 220 mg/week, with testosterone and hCG. This is one reported exposure, not a starting amount.
Women's accounts	One ten-week log rose from 25 to 50 mg/week, split twice weekly, with Anavar added later. A separate user reported voice cracking at 50 mg/week after four weeks.
Oral acetate	No dependable numerical community band is established here. Injection totals cannot fill that gap.

Notes

Enanthate: 400–600 mg/week in the existing male-use discussion; some report 300 mg/week. Lower examples exist: simplestoic3 reported 200 mg/week with testosterone. The band is not a minimum-effective-dose scale. r/steroids: Methenolone experience thread, December 2021 (Community discussion · Accessed 2026-09-30)

Another injection account: 110 mg every 3.5 days, totaling 220 mg/week. snkloverpgh combined this with testosterone and hCG. It is a reported exposure, not a starting amount. ExcelMale: Recent bloodwork (Personal report · Accessed 2026-09-30)

One woman's injection log: 25 mg/week rising to 50 mg/week. sleepy_sushi_ split injections twice weekly over ten weeks and added Anavar later. A separate reply described voice cracking after four weeks at 50 mg/week. Smaller quantities do not establish a safe threshold for women. r/steroidsxx: First Primo Cycle Experience and Report (Community discussion · Accessed 2026-09-30)

Oral acetate: no dependable community band established here. The existing record describes oral use as a thinner, expensive discussion without a numerical band. Injectable totals should not fill that gap.

Source context — ExcelMale: Recent bloodwork: One mixed-treatment account, self-reported assays, no original lab sheet independently authenticated. Lower future-dose speculation is not actual exposure and is omitted.

Half-life, onset & duration

Felt onset	Change is described over weeks: a guide claims 4–6 weeks, older notes describe subtle changes around weeks 6–12, and one strength account says weeks 10–12.
Felt duration	No dependable per-injection or after-cycle benefit window is established. Post-cycle estrogen results do not measure lasting gains or clearance.
Half-life	Enanthate claims range from 5 to 10 days; a copied chart says 10.5 days without a verified study. Oral acetate has no substantiated estimate in this sample.

Notes

Weeks, with no single reliable start point. The existing discussion describes quiet weeks 1–4 and subtle appearance changes around weeks 6–12. Eroids author logan claims 4–6 weeks; another Reddit account describes strength becoming noticeable around weeks 10–12. These describe different outcomes and expectations, not a guaranteed timetable. Eroids: Primobolan What I Know (Community opinion · Accessed 2026-09-30) · r/steroids: Methenolone experience thread, June 2021 (Community discussion · Accessed 2026-09-30)

No dependable single-injection or post-cycle benefit duration. Grami reported normal estrogen immediately after ending testosterone/Primo enanthate, then low estrogen three weeks later, with increased libido but no other symptoms described. This mixed-cycle laboratory timeline is not a clearance clock or lasting-gains measurement. r/steroids: Methenolone experience thread, December 2021 (Community discussion · Accessed 2026-09-30)

Enanthate: 5-day versus 10-day claims; a copied chart says 10.5 days. The 2019 chart cites no underlying study; its scientific origin remains unverified. These are circulated claims, not participant measurements. Half-life describes the measured amount falling by half, not how long gains last. Steroids.Reviews forum: Primobolan Half Life (Secondhand community claim · Accessed 2026-09-30)

Oral acetate: no substantiated estimate in this community sample. A generic ester chart is not an oral methenolone measurement. The enanthate injection estimate cannot be carried across to tablets. Steroids.Reviews forum: Primobolan Half Life (Secondhand community claim · Accessed 2026-09-30)

Source context — Eroids: Primobolan What I Know: Older community guide on source-review platform. Strong safety and 90%-gain-retention promises are unsupported and rejected. Its advice to increase amounts, stack drugs or run 16 weeks is not adopted as a regimen.

Source context — r/steroids: Methenolone experience thread, June 2021: Anecdotes and interpretation, not a clinical aromatase-inhibition experiment. Safety assurances and homebrewing instructions in the original thread are not adopted. No all-comment inspection claim.

Source context — Steroids.Reviews forum: Primobolan Half Life: Commercial supplier-review site with actual forum bodies. 10.5-day chart has no cited original measurement; primary origin is unresolved. The question reports seeing 5–10 days, not personal measurements. Page 2 not inspected; no validated human or animal PK value claimed.

Cycles people discuss

Longer-course talk	12+ weeks appears because change is described as slow. Actual accounts include 10, 15 and 16 weeks; these do not establish safe repeats, recovery or a benefit from extending use.

Notes

12+ weeks in older discussion; actual logs vary. Examples include a ten-week women's log, a report still underway at week 15 and a 16-week testosterone/Primo account with Anavar added near the end. Slow-change expectations explain the longer-course talk. These lengths do not establish safe repeat intervals, recovery or the value of extending use. r/steroidsxx: First Primo Cycle Experience and Report (Community discussion · Accessed 2026-09-30) · r/steroids: Compounds — Primobolan, October 2022 (Community discussion · Accessed 2026-09-30) · r/steroids: Methenolone experience thread, December 2021 (Community discussion · Accessed 2026-09-30)

Stacks

Testosterone	The main pairing in the record. Appearance, training and estrogen changes describe combined cycles rather than isolated methenolone effects.
Other mixed cycles	Accounts also include DHB, early Dianabol, later Anavar or hCG. One history included growth hormone and insulin; these are different combinations.

Notes

With testosterone: This is the main pairing in the saved accounts. Appearance, training and estrogen changes describe combined exposure rather than an isolated methenolone effect. [community]

Quality mass means appearance and gradual progress, not a special kind of muscle. People use the phrase for fullness, definition and less water-weight change than they associate with testosterone or Dianabol. Testosterone often accompanies Primo, so comparisons describe whole cycles rather than an isolated methenolone effect. r/steroids: Methenolone experience thread, June 2021 (Community discussion · Accessed 2026-09-30)

Estrogen changes do not follow one universal testosterone-to-Primo ratio. tryhardfreshman described favorable estrogen levels and fewer estrogen-related complaints. They also warned that people with lower estrogen on testosterone may feel worse after adding Primo. This does not prove a predictable ratio or an estrogen-blocking mechanism. r/steroids: Methenolone experience thread, June 2021 (Community discussion · Accessed 2026-09-30)

Watch for

Hair loss and injection pain	Severe shedding within weeks and substantial injection pain are reported, alongside accounts without shedding. Price or pain does not authenticate the contents.
Steroid-class harms	Cholesterol/cardiovascular effects, impaired fertility and potentially permanent voice or genital changes remain concerns despite the mild reputation.
Estrogen varies	There is no universal testosterone-to-Primo ratio. Very low reported estradiol can coexist with few symptoms; neither a reassuring feeling nor bloodwork proves long-term safety.
Suspected substitution	Expensive subtle results prompt fake-Primo suspicions, but lack of progress and hormone panels cannot chemically identify a vial.

Notes

Hair shedding and injection pain can be substantial. WarLord055 reported severe shedding within weeks on testosterone plus Primo, easing after Primo stopped. Other posters report no noticeable shedding. Oil injections also produce pain in some accounts; neither pain nor price authenticates the contents. r/steroids: Compounds — Primobolan, October 2022 (Community discussion · Accessed 2026-09-30)

Steroid-class risks include cholesterol, fertility and permanent masculinizing changes. DEA describes cardiovascular consequences of adverse cholesterol changes, reduced sperm production, menstrual changes and potentially permanent voice or genital changes. These are class cautions, not rates measured for Primo users. A reassuring experience or blood panel does not establish long-term safety. DEA: Steroids fact sheet (Official context · Accessed 2026-09-30)

A low laboratory value may not match how someone feels. snkloverpgh reported sensitive estradiol of 4 pg/mL after eight weeks on Primo, testosterone and hCG, yet no perceived sexual or other negative symptoms. ExcelMale: Recent bloodwork (Personal report · Accessed 2026-09-30)

Cost and suspected fake Primo complicate interpretation. The existing discussion includes expensive, subtle results and suspicion that a vial contains testosterone or Masteron instead. Lack of progress is not proof of substitution. Hormone or cholesterol bloodwork can describe what changed in the person; it cannot chemically identify a vial. Forum, clinic and product-review claims are different evidence sources.

Source context — DEA: Steroids fact sheet: Class-wide educational context, not methenolone-specific incidence or dose-response estimates. Undated page; no treatment protocol derived.

Full notes

What Primo means in these discussions

Injectable enanthate and oral acetate are different forms. Primobolan Depot usually means methenolone enanthate in an oil-based intramuscular injection. Oral Primobolan contains the acetate form. This is a steroid rather than a peptide needing reconstitution; oral and injected milligrams are not interchangeable. Most of the accounts below concern injections. Community
Quality mass means appearance and gradual progress, not a special kind of muscle. People use the phrase for fullness, definition and less water-weight change than they associate with testosterone or Dianabol. Testosterone often accompanies Primo, so comparisons describe whole cycles rather than an isolated methenolone effect. Community Reddit r/steroids

What people hope to gain

A fuller look without a dramatic sensation. sickunt93 described fuller shoulders and traps and more visible veins while feeling almost unchanged. Their photographed cutting cycle also included testosterone and DHB. They liked the appearance but could not judge a full bulking course; cost ended a later 500-mg run after six weeks. Reddit r/steroids
Better strength, recovery or well-being for some. DoYouEvenDoubleLeg's week-15 report favored a Primo-containing cycle over previous testosterone-only use. It also included early Dianabol and isotretinoin, severe initial injection pain, initial sleep difficulty and a cholesterol concern. The author blamed isotretinoin for cholesterol; that attribution was not established. Reddit r/steroids

Doses people report

These are accounts and circulated quantities, not a regimen. mg means milligrams; weekly totals are not amounts per injection.

Enanthate: 400–600 mg/week in the existing male-use discussion; some report 300 mg/week. Lower examples exist: simplestoic3 reported 200 mg/week with testosterone. The band is not a minimum-effective-dose scale. Community Reddit r/steroids
Another injection account: 110 mg every 3.5 days, totaling 220 mg/week. snkloverpgh combined this with testosterone and hCG. It is a reported exposure, not a starting amount. Personal report
One woman's injection log: 25 mg/week rising to 50 mg/week. sleepy_sushi_ split injections twice weekly over ten weeks and added Anavar later. A separate reply described voice cracking after four weeks at 50 mg/week. Smaller quantities do not establish a safe threshold for women. Reddit r/steroidsxx
Oral acetate: no dependable community band established here. The existing record describes oral use as a thinner, expensive discussion without a numerical band. Injectable totals should not fill that gap. Community

Half-life claims people circulate

Enanthate: 5-day versus 10-day claims; a copied chart says 10.5 days. The 2019 chart cites no underlying study; its scientific origin remains unverified. These are circulated claims, not participant measurements. Half-life describes the measured amount falling by half, not how long gains last. Steroids.Reviews forum
Oral acetate: no substantiated estimate in this community sample. A generic ester chart is not an oral methenolone measurement. The enanthate injection estimate cannot be carried across to tablets. Steroids.Reviews forum Community

When changes are noticed

Weeks, with no single reliable start point. The existing discussion describes quiet weeks 1–4 and subtle appearance changes around weeks 6–12. Eroids author logan claims 4–6 weeks; another Reddit account describes strength becoming noticeable around weeks 10–12. These describe different outcomes and expectations, not a guaranteed timetable. Community Eroids forum Reddit r/steroids

How long effects may continue

No dependable single-injection or post-cycle benefit duration. Grami reported normal estrogen immediately after ending testosterone/Primo enanthate, then low estrogen three weeks later, with increased libido but no other symptoms described. This mixed-cycle laboratory timeline is not a clearance clock or lasting-gains measurement. Reddit r/steroids

Course lengths people discuss

12+ weeks in older discussion; actual logs vary. Examples include a ten-week women's log, a report still underway at week 15 and a 16-week testosterone/Primo account with Anavar added near the end. Slow-change expectations explain the longer-course talk. These lengths do not establish safe repeat intervals, recovery or the value of extending use. Community Reddit r/steroidsxx Reddit r/steroids Reddit r/steroids

What the mild reputation can hide

Hair shedding and injection pain can be substantial. WarLord055 reported severe shedding within weeks on testosterone plus Primo, easing after Primo stopped. Other posters report no noticeable shedding. Oil injections also produce pain in some accounts; neither pain nor price authenticates the contents. Reddit r/steroids Community
Steroid-class risks include cholesterol, fertility and permanent masculinizing changes. DEA describes cardiovascular consequences of adverse cholesterol changes, reduced sperm production, menstrual changes and potentially permanent voice or genital changes. These are class cautions, not rates measured for Primo users. A reassuring experience or blood panel does not establish long-term safety. Official context
U.S. federal Schedule III. Methenolone is explicitly listed in 21 CFR 1308.13(f)(49), including its esters. Legal classification is separate from a forum's product claims or safety reputation. Official context

What the experience reports add

Estrogen changes do not follow one universal testosterone-to-Primo ratio. tryhardfreshman described favorable estrogen levels and fewer estrogen-related complaints. They also warned that people with lower estrogen on testosterone may feel worse after adding Primo. This does not prove a predictable ratio or an estrogen-blocking mechanism. Reddit r/steroids
A low laboratory value may not match how someone feels. snkloverpgh reported sensitive estradiol of 4 pg/mL after eight weeks on Primo, testosterone and hCG, yet no perceived sexual or other negative symptoms. Personal report
Little added benefit is a real outcome. stanozolololol reported becoming weaker and flatter during an initial combination, then subtle cosmetic changes during higher-testosterone use but no gym benefit they could separate from testosterone, growth hormone and insulin. Irritation and scalp discomfort reduced the appeal. Another satisfied 16-week user still reported intermittent prostate complaints. Reddit r/steroids
The women's log had a rough start and an incomplete payoff. sleepy_sushi_ described fatigue and no strength change by week four, improving energy around week six, then later Anavar use and some lifting progress. Added birth-control pills alongside Nexplanon complicated the timeline. At ten weeks the experience still fell short of expectations; a scratchy throat and later replies about voice changes temper the mild label. Reddit r/steroidsxx
Cost and suspected fake Primo complicate interpretation. The existing discussion includes expensive, subtle results and suspicion that a vial contains testosterone or Masteron instead. Lack of progress is not proof of substitution. Hormone or cholesterol bloodwork can describe what changed in the person; it cannot chemically identify a vial. Forum, clinic and product-review claims are different evidence sources. Community