Arimistane (androsta-3,5-diene-7,17-dione)
A designer steroid, related to 7-keto-DHEA, sold in 'performance' supplements as an estrogen blocker. It was never developed as a medicine and has no human safety trials.
Legal status: Never approved as a medicine; sold in unregulated supplements, status varies by country; prohibited in sport at all times (WADA S4.1).
What it gives
What people use it for and what the sources report. Strength is a general category from the literature: mild, clear or strong.
Purpose
Marketed to steroid users and natural lifters to curb estrogen or 'boost testosterone', often after stopping steroids. It has no medical use; anti-doping labs list it as an aromatase inhibitor.
What people seek and what studies show
There are no studies of its effects or safety in people. The only human data are anti-doping studies in three volunteers given a single dose to identify its breakdown products; that single dose caused no relevant change in the urinary steroid profile. Whether it lowers estrogen or raises testosterone in humans is unproven.
Effects
Evidence: Anecdotal — no real studies
Possible side effects
Possible does not mean certain: whether they appear depends on dose, duration, individual response and monitoring. Below — what to watch for and how to notice it early.
3 possible side effects
level · how often it is reportedWhat the levels mean
Level: general category from the literature, not your personal risk
How often
- common
- reported often
- possible
- reported in some people
- rare
- reported occasionally
How to lower the risks
For 1 of 3 possible side effects there are specific ways to lower the chance: everyday measures, supplements and options a doctor may consider. For the rest — general advice. No measure removes a risk completely.
Products obtained without a prescription are often fake, mislabeled or non-sterile, and there is no way to check at home. For legal supplements, look for third-party testing (Informed Sport, NSF).
What is unknown cannot be lowered, only avoided; tell your doctor what you have taken.
Low-level side effects
How each option helps (1)
- Regular blood tests — Testing ends guesswork use of aromatase inhibitors — prescription drugs that can push estrogen too low and harm joints, libido, mood and lipids.
Check-ups and blood tests
Which tests and check-ups to do and when. This is a guide — agree the exact schedule with your doctor.
Which doctors can help
For women
Not studied in women; aromatase inhibitors act unpredictably before menopause, and supplements may contain undeclared steroids.
Myth & fact
“Arimistane is a natural, legal supplement ingredient.”
It is a designer steroid that the FDA's lab identified in performance supplements, it is prohibited in sport, and it has never been tested for safety in people.
Combinations
No specific combination notes for this substance yet. The stack check still adds up side effects that several substances share.
Sources
Possible side effects by body system, combinations, how to lower the risks and which tests to do — free.
Open the stack check