What is the half-life of YK-11?

YK-11 has an approximate elimination half-life of 12 h. Daily dosing holds steady levels.

How long does YK-11 stay in your system?

Roughly 97% of a dose has cleared after five half-lives — about ~2.5 days for YK-11. That is the window that matters for washouts, bloodwork and surgery.

YK-11 is typically administered by the oral route. Reported user ranges are roughly 5-10 mg daily, with no clinical basis.

What are the risks of YK-11?

Being steroidal, it likely carries androgenic side effects and testosterone suppression Almost no human safety data exist, so effects and risks are largely unknown Not approved for human use; an unapproved research chemical banned in sport

YK-11

A synthetic steroidal compound marketed as a SARM that is also claimed to inhibit myostatin. Human data are minimal and it is poorly characterized.

Half-life: 12 h
Out of system: ~2.5 days
Route: Oral
Level: Intermediate

Daily dosing holds steady levels. After the last dose, roughly 97% has cleared in ~2.5 days (five half-lives) — the window that matters for washouts, bloodwork and surgery.

What YK-11 is used for

Marketed for rapid strength and muscle gains via claimed myostatin inhibition
Cell studies suggest it can raise follistatin and drive muscle protein signaling

How it's typically used

Reported user ranges are roughly 5-10 mg daily, with no clinical basis.

What to watch for

Being steroidal, it likely carries androgenic side effects and testosterone suppression
Almost no human safety data exist, so effects and risks are largely unknown
Not approved for human use; an unapproved research chemical banned in sport

Common questions

What is the half-life of YK-11?: YK-11 has an approximate elimination half-life of 12 h. Daily dosing holds steady levels.
How long does YK-11 stay in your system?: Roughly 97% of a dose has cleared after five half-lives — about ~2.5 days for YK-11. That is the window that matters for washouts, bloodwork and surgery.
How is YK-11 taken?: YK-11 is typically administered by the oral route. Reported user ranges are roughly 5-10 mg daily, with no clinical basis.
What are the risks of YK-11?: Being steroidal, it likely carries androgenic side effects and testosterone suppression Almost no human safety data exist, so effects and risks are largely unknown 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

YK-11: A Tracking Guide for a Steroidal Myostatin-Claim Compound

A harm-reduction look at YK-11, a steroidal compound sold as a SARM with myostatin-inhibition claims, and why the human evidence is essentially absent.

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.