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Primobolan

Methenolone / Primo · Anabolic-androgenic steroid

Research reference only. Pepdex does not sell, supply or track this compound, and nothing here is guidance to use it — this page exists so the evidence and the risks are visible.

What it is

An injectable (enanthate) or oral (acetate) anabolic steroid with a reputation as one of the "mildest" AAS — moderate anabolic effect, low androgenic load, no aromatization to estrogen. That reputation, plus its association with physique sport, keeps it perpetually popular and perpetually faked.

What human evidence shows

Almost no modern clinical literature — it had niche medical uses decades ago (wasting, some anemias) and has largely vanished from medicine. What is known: it builds less mass than testosterone at comparable exposure, does not aromatize, and still suppresses natural testosterone production like every AAS. "Mild" describes side-effect intensity, not safety.

Risks

Full HPTA suppression — natural testosterone shuts down, and recovery after stopping is neither fast nor guaranteed. Lipid damage (HDL crushed), cardiac remodeling risk with extended use, hair loss in the predisposed. Because real methenolone is expensive, it is among the most counterfeited steroids — much of what is sold as "primo" is testosterone or nothing. No aromatization means no estrogen bloat, which quietly tempts people into longer exposure.

Legal status

US: Schedule III controlled substance. Unmanufactured in the US — everything on the grey market is imported or underground.

Evidence base

C17 research papers
early literature

Early human evidence: at least one human trial report, and not much beyond it.

phase 3/4
0
randomised
0
reviews
0
human trials
1

Counts are of published papers, not distinct trials, and measure how much research exists — not whether this works or is safe for you.

Research (12)

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Where next

Every compound in the catalogThe full non-peptide index, with evidence grades.→The peptide indexInjectable peptides, half-lives and what trials used.→Spotting a scam vendorRed flags, COA checks and what traceability looks like.→