Methenolone enanthate, often known by its brand name Primobolan, is an injectable synthetic anabolic-androgenic steroid (AAS) derived from dihydrotestosterone (DHT). It is characterized by relatively mild anabolic properties and very low androgenic effects compared to many other steroids. In medical contexts, methenolone enanthate has been used to treat muscle wasting in diseases, osteoporosis, and to promote weight gain in underweight infants. It is specifically an enanthate ester formulation, meaning it has a long-acting profile due to the slow release of methenolone from the injection site. This extended release allows for less frequent administration compared to shorter-esterified versions. Methenolone enanthate is a controlled substance in many countries due to its potential for misuse and abuse, particularly in non-medical settings for performance and physique enhancement. It is known for its ability to promote lean muscle mass gains and increase strength without significant estrogenic side effects like water retention or gynecomastia. However, like all anabolic steroids, it carries a risk of androgenic side effects and suppression of natural testosterone production.
Deep dive
Tap a section to expand.
Known interactions
Category rule: peptide × hormone
Note
Injectable peptides plus hormones can have overlapping or compounding effects that aren't always well characterized.
Track bloodwork with a provider; don't assume combinations are neutral.
Frequently asked
Sources referenced
["DrugBank: Methenolone Enanthate (DB01481)", "PubChem: Methenolone Enanthate (CID 93310)", "U.S. Food and Drug Administration (FDA) Labels (for general anabolic steroid information)", "MedlinePlus"]
Stackwise compiles summaries from publicly available scientific and regulatory references. Always verify important decisions with a licensed clinician.
Related compounds
Others in the hormone category or studied for the same goals.