NOT MEDICAL ADVICE. No information on this site should be considered medical advice. Research peptides are not intended for human consumption — in-vitro lab use only. Consult a physician prior to introducing anything into the human body.
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Home/Muscle Building & Performance/YK-11

YK-11

A synthetic steroidal research compound grouped with SARMs in vendor catalogs; not a peptide, with very limited peer-reviewed data.

Overview

YK-11 is a synthetic steroidal research compound often grouped with selective androgen receptor modulators (SARMs) in vendor catalogs and discussed mainly in bodybuilding-oriented communities. It is not a peptide. Peer-reviewed characterization is very limited, and most circulating claims about its activity derive from marketing rather than independent studies.

Mechanism

Vendor literature describes YK-11 as an androgen-receptor-related agent with proposed myogenic activity. Some sources suggest it may act as a partial androgen-receptor agonist or influence follistatin expression, but these statements are not backed by robust published data. Its receptor pharmacology and metabolic fate remain poorly defined.

Expected Effects

  • Claims of muscle-building and myostatin-related effects are anecdotal and unverified
  • No controlled human studies exist
  • Cellular or animal data are minimal in the accessible literature

Side Effects & Tolerability

As an uncharacterized synthetic steroid-like compound, potential effects on the endocrine axis, liver, and lipids cannot be ruled out. Any use is confined to research settings, and even there its identity and purity require careful verification.

Storage

Store the compound as supplied, protected from light and moisture, per the manufacturer recommendations.

Related peptides

ACE-031Soluble ActRIIB-Fc decoy receptor for myostatin studied as a muscle-mass candidate; a protein biologic, not a peptide, with a discontinued clinical program.Follistatin 344Natural glycoprotein isoform (344 amino acids) that neutralizes myostatin; research interest centers on gene-therapy delivery to increase muscle mass.GDF-8 (Myostatin)Myostatin (GDF-8), a TGF-beta-family protein that limits skeletal muscle growth; a research target for muscle-loss conditions.IGF-1 LR3Engineered 83-amino-acid analog of insulin-like growth factor 1 with reduced binding-protein affinity, used in growth research.IGF-DES (1-3)Naturally occurring truncated IGF-1 variant lacking the first three amino acids; high receptor potency with a very short half-life.Muscle Fiber Type Conversion AnalogsCatalog heading about shifting muscle fiber types; no defined peptide product with published evidence under this name.