YK-11

Product Overview

YK-11 is a synthetic androgen-receptor-active compound commonly classified and marketed within the selective androgen receptor modulator (SARM) research category. YK-11 is structurally and pharmacologically distinct from many of the better-characterised non-steroidal SARMs. It has attracted particular research interest because experimental studies have investigated its interaction with the androgen receptor (AR) alongside potential effects on follistatin and myostatin-associated pathways.

Unlike non-steroidal SARMs such as RAD-140, YK-11 has a steroidal chemical structure, making precise classification and comparison with other SARMs more complex. Research-Chem.uk supplies YK-11 as a laboratory research compound intended strictly for analytical and scientific research applications.

What Is YK-11?

YK-11 is a synthetic compound that has been investigated for its activity at the androgen receptor. It is frequently grouped with SARMs in commercial and research settings, but it differs from many classical SARMs because it possesses a steroidal structure rather than the non-steroidal structures found in compounds such as RAD-140, Ostarine and Ligandrol.

Published research on YK-11 is relatively limited compared with more extensively characterised androgen-receptor ligands.

One of the primary scientific interests surrounding YK-11 originates from experimental work investigating its effects on follistatin expression in muscle-derived cells. Follistatin is a protein involved in the regulation of several members of the transforming growth factor-beta (TGF-β) superfamily, including myostatin.

This has led to interest in YK-11 as an experimental compound for studying the relationship between androgen receptor signalling and muscle-regulatory pathways.

However, the proposed mechanisms should be considered preliminary because much of the available YK-11 research consists of cell-based and preclinical investigations rather than extensive human pharmacological studies.

How Is YK-11 Investigated in Research?

Research involving YK-11 has focused primarily on molecular and cellular mechanisms associated with androgen-receptor signalling. Experimental areas include:

• Androgen receptor activation
• AR-dependent gene expression
• Follistatin expression
• Myostatin-associated pathways
• Myogenic differentiation
• Skeletal-muscle signalling
• Muscle-cell proliferation
• Muscle-cell differentiation
• Androgen pharmacology
• Steroidal ligand activity

The original research that generated significant interest in YK-11 examined its effects in C2C12 myoblast cells, a commonly used experimental model for studying skeletal-muscle differentiation. Researchers observed changes in follistatin expression following exposure to YK-11 and investigated whether the compound's effects were associated with androgen-receptor signalling.

This provides a scientific basis for further investigation but does not establish that the same mechanisms or outcomes occur in humans.

YK-11 Research Applications

What Does the Research Say?

The research literature surrounding YK-11 is considerably smaller than that available for compounds such as RAD-140 or Ostarine.

The study most frequently associated with YK-11 investigated its effects on C2C12 skeletal-muscle cells. Researchers reported that YK-11 increased follistatin expression and examined evidence suggesting that this response was associated with androgen-receptor signalling. These findings generated interest because follistatin is involved in the regulation of myostatin and other TGF-β-family signalling pathways.

However, the study was conducted using a cellular model, rather than a clinical human population. Consequently, the findings provide mechanistic evidence for further research but cannot establish that YK-11 produces equivalent effects in humans.

The limited nature of the published literature is particularly important when assessing YK-11. Many claims commonly associated with the compound online are substantially broader than the scientific evidence currently available.

There is insufficient clinical research to establish YK-11 as a safe or effective human anabolic agent, therapeutic compound or performance-enhancing substance.

From a laboratory perspective, its greatest research interest lies in the relationship between androgen-receptor signalling, follistatin expression and muscle-cell biology.

Research References

• Kanno Y, et al. (2011). YK11, a novel anabolic steroid, induces myoblast proliferation and differentiation by activating the androgen receptor and increasing follistatin expression.

  Research examining YK-11 in C2C12 skeletal-muscle cells and its relationship with androgen-receptor signalling and follistatin. This study represents the primary published experimental basis for the commonly proposed follistatin-related mechanism of YK-11.

• Mendell JR, et al. Research into follistatin and myostatin-associated signalling provides broader biological context for interpreting experimental findings involving YK-11.

• Lee SJ. (2004). Regulation of muscle mass by myostatin. Annual Review of Cell and Developmental Biology, 20, 61–86.

  Review describing the biological role of myostatin in skeletal-muscle development and regulation.

• Sinha-Hikim I, et al. Research concerning androgen-receptor signalling and skeletal-muscle biology provides additional context for investigating androgen-active compounds such as YK-11.

• Researchers should consult the original publications when evaluating YK-11 because the available evidence is relatively limited and is heavily weighted toward cellular and mechanistic research.

YK-11 Product Specifications

YK-11 is structurally distinct from the non-steroidal SARMs commonly encountered in research and commercial literature. Researchers should therefore consider its chemical and pharmacological characteristics independently rather than assuming that all SARM-classified compounds share the same mechanism.

Quality and Purity

At Research-Chem.uk, analytical quality and batch traceability are central to our research compound range.

YK-11 is supplied as a defined research compound with analytical documentation supporting material identification and laboratory record keeping. HPLC analysis is used as part of the analytical quality-control process, with batch-specific documentation available.

Researchers should always refer to the relevant Certificate of Analysis (COA) when recording the analytical characteristics of a particular batch.

Laboratory Research Applications

YK-11 may be suitable for laboratory investigations involving:

• Androgen receptor pharmacology
• Selective androgen receptor research
• AR-dependent gene expression
• Follistatin expression
• Myostatin-associated pathways
• Skeletal-muscle cell biology
• Myoblast proliferation
• Myogenic differentiation
• Muscle-regulatory signalling
• Steroidal androgen-receptor ligands
• Receptor-ligand interactions
• Molecular pharmacology
• Cell-based research
• Analytical chemistry

YK-11 is supplied strictly as a research compound and is not intended to diagnose, treat, cure or prevent any disease or medical condition.

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