What purity is this product?

All PeptideBull products are HPLC-tested to ≥99% purity. A Certificate of Analysis (COA) is available for every product.

Is this product for human consumption?

No. All products sold on PeptideBull are strictly for in-vitro laboratory research use only. Not for human or veterinary consumption.

How should I store this peptide?

Store lyophilized peptide at −20°C. Once reconstituted with bacteriostatic water, refrigerate at 2–8°C and use within 28 days.

How do I reconstitute this peptide?

Add sterile bacteriostatic water slowly along the inner vial wall and gently swirl — do not shake. Allow the peptide to dissolve naturally.

What is the shipping method?

PeptideBull ships domestically within the USA. Orders are processed within 1–2 business days. Discreet, professional packaging on all shipments.

YK 11

Name: YK 11
Brand: XT Labs
Price: 99.00 USD
Availability: InStock

XT Labs

$99.00

Volume Savings Buy more, save more — click a tier to select

3 Pack SAVE 10% — —

Most Popular 6 Pack SAVE 15% — —

10 Pack SAVE 20% — —

Lab Tested

Fast Shipping

Research Grade

Secure Payment

Join our community

Telegram Discord Reddit

This product is intended for laboratory and research use only. Not for human consumption.

YK-11 is a unique compound acting both as a partial androgen receptor agonist and as a myostatin inhibitor, distinguishing it from conventional SARMs. Research has examined YK-11 for its dual mechanism — androgenic receptor pathway activation alongside suppression of the myostatin (GDF-8) pathway that normally limits muscle growth. Preclinical in-vitro research has demonstrated YK-11's capacity to strongly induce follistatin expression and promote muscle cell differentiation. Its combined SARM/myostatin inhibitor profile makes it a unique and highly studied research compound. PeptideBull provides YK-11 at research-grade purity. Not for human or veterinary consumption.