YK-11
YK-11 is a catalog-expanded sarm entry in ProtoComp's source-backed compound corpus. It is included for search, calculator math, stack awareness, and future research curation based on add sarm category and seed, expand compound catalog, explicit_target_list, local_seed, project_target, wiki_sarm, wikipedia_table. Published dosing, cycle length, and clinical-use claims are intentionally left null until compound-specific evidence is reviewed.
Marketed as a SARM but classified as a steroidal myostatin modulator in the literature. No published human trials — dosing is anecdotal.
Short cycles recommended due to hepatotoxicity concerns and lack of human safety data.
Off-cycle: 8 weeks
Short half-life ~6 hours — usually split into 2 doses.
Contraindications
- • Liver disease
- • Cardiovascular disease
- • Pregnancy
Common side effects
- • HPG axis suppression
- • Hair shedding
- • Aggression
Serious risks
- • Hepatotoxicity — steroidal structure, higher liver stress than non-steroidal SARMs
- • Tendon issues reported anecdotally
- • Long-term safety completely unknown — no human trials
Drug interactions
- • Avoid with hepatotoxic compounds
Requires monitoring
- • Liver function
- • Testosterone
- • Creatine kinase
Pregnancy / breastfeeding
Contraindicated
Male
Strong suppression expected
Female
Not recommended — no female data and virilization risk
- Often mislabeled as "non-suppressive myostatin inhibitor" — HPG suppression is documented
- Steroidal structure — closer to a designer steroid than a non-steroidal SARM
Sign in to calculate your dose, add this compound to your stack, and check for interactions with your current cabinet.