YK-11 (Myostine) Capsules

A. Introduction

YK-11 (Myostine) represents a specialized class of SARM characterized by its steroidal backbone, derived from ethisterone. It is a primary subject for research institutions investigating dual-mechanism ligands that demonstrate both androgen receptor (AR) agonism and myostatin inhibition through the induction of the antagonist protein, follistatin.

B. Scientific Overview

Chemically identified as (17α,20E)-17,20-[(1-methoxyethylidene)bis(oxy)]-3-oxo-19-norpregna-4,20-diene-21-carboxylic acid methyl ester ($C_{25}H_{34}O_{6}$), YK-11 is studied for its ability to act as a gene-selective partial agonist. In a laboratory context, researchers focus on its capacity to stimulate the expression of myogenic regulatory factors in cell cultures, specifically targeting the REV-ERB and Follistatin pathways to modulate cellular growth cycles.

C. Product Specifications

• Form: Encapsulated powder for laboratory measurement
• Active Concentration: 5mg per unit
• Chemical Class: Steroidal SARM / Myostatin Inhibitor Analogue
• Molecular Formula: $C_{25}H_{34}O_{6}$
• Purity: ≥99% (HPLC Verified)
• Quantity: Available in standard laboratory counts
• Storage: Store in a cool, dry environment (15°C to 25°C) protected from direct sunlight and moisture.

D. Laboratory Use Context

YK-11 capsules are provided exclusively for in-vitro research and analytical testing. They are a critical reagent for:

• Investigating the up-regulation of Follistatin in muscle cell lines.
• Studying the structural biology of the 19-norpregna-4,20-diene scaffold.
• Calibration and validation of LC-MS/MS and GC-MS equipment.
• Comparative analysis of steroidal vs. non-steroidal androgen receptor ligands.

E. Quality Testing

• Analytical Precision: Each batch undergoes rigorous HPLC analysis to confirm chemical purity and 5mg concentration accuracy per capsule.
• Structural Identity: Mass Spectrometry (MS) and Proton NMR verify the presence of the complex methoxyethylidene group and steroidal nucleus.
• Homogeneity: Advanced encapsulation technology ensures a uniform distribution of the reagent for reproducible research results.

F. Shipping Handling

We utilize high-barrier, moisture-proof, and UV-protected packaging to maintain the chemical stability of the YK-11 capsules during transit. Our logistics network provides professional, discreet worldwide shipping to support the requirements of international research facilities and commercial laboratories.

G. Compliance Disclaimer (CLEAR PROMINENT)

FOR RESEARCH USE ONLY. NOT FOR HUMAN CONSUMPTION. This product is a research chemical and is strictly for in-vitro laboratory applications and analytical testing. It is not intended for diagnostic or therapeutic use in humans or animals. No medical claims or dosages are provided. The purchaser assumes all responsibility for compliance with local and international regulations regarding the acquisition and handling of this substance.