Andarine (S4)
An early oral SARM (S4) known for a drier, harder look and strength gains. It was never approved and has largely been superseded by newer SARMs.
- Half-life
- 4 h
- Out of system
- ~20 h
- Route
- Oral
- Level
- Intermediate
Short-acting — protocols usually dose daily. After the last dose, roughly 97% has cleared in ~20 h (five half-lives) — the window that matters for washouts, bloodwork and surgery.
What Andarine (S4) is used for
- Reported to add strength and lean, dry muscle with some fat-loss effect
- Binds androgen receptors selectively in muscle and bone in preclinical work
How it's typically used
Reported user ranges are about 25-50 mg daily, often split through the day.
What to watch for
- Commonly causes a reversible yellow tint to vision and trouble adjusting to light
- Suppresses natural testosterone and requires a PCT after longer use
- Not approved for human use; an unapproved research chemical banned in sport
About SARMs
- What they are
- Selective androgen receptor modulators — oral compounds designed to hit muscle and bone androgen receptors while sparing prostate and skin. None is an approved medicine anywhere.
- How they're run
- Taken orally once a day, typically in 8–12 week blocks.
- What to watch
- The "non-suppressive" reputation is marketing: most suppress natural testosterone, and several are liver-toxic. Independent testing repeatedly finds products containing something other than the label. Bloodwork before and after is the minimum.
Full guide
Andarine (S4): A Tracking Guide for an Older Cutting SARM
A harm-reduction look at andarine, its use in cutting phases, and the reversible vision side effect that sets it apart from other SARMs.
Other sarms
Peptid AI is an educational and self-tracking tool — not a medical service, and not a vendor. Nothing here is medical advice, a prescription, or an endorsement. Doses reflect what is commonly reported in research literature; they are not recommendations. Many compounds listed are experimental, not approved for human use, and/or controlled substances that are illegal to possess without a prescription in many countries. Always consult a qualified physician before starting, changing, or stopping any protocol.