Starter Refinement Kit

MK-2866 SAFETY DATA SHEET
S-4 SAFETY DATA SHEET

The Starter Refinement Kit is an entry-level two-compound combination formulated for preclinical investigation of body composition models under controlled androgenic stimulation. It pairs two of the mildest SARMs in the catalogue, providing a research framework focused on tissue preservation and selective anabolic activity in caloric deficit or recomposition contexts.

The rationale for combining MK-2866 and S-4 is grounded in their complementary selectivity profiles. Both compounds act as tissue-selective androgen receptor modulators with limited activity in non-target organs, but differ in receptor binding kinetics and downstream gene expression patterns. Together they allow researchers to model attenuated, selective anabolic signalling under simulated catabolic or hypocaloric conditions, where preservation of lean mass and contractile performance is the primary research outcome.

Included in this kit:

• 1 × MK-2866 | 100 pellets, 10 mg active compound per pellet
• 1 × S-4 | 100 pellets, 25 mg active compound per pellet

Total: 200 pellets / 3,500 mg active compound.

Compound roles in this bundle:

MK-2866 (Ostarine) – non-steroidal SARM contributing muscle-preserving activity under simulated caloric deficit and disuse conditions, with minimal off-target effects on the prostate or other androgen-sensitive tissues.

S-4 (Andarine) – partial AR agonist providing complementary anabolic activity in muscle and bone, with documented effects on contractile performance and fatigue resistance in rodent models.

Combined research applications:

• Preclinical models of body composition refinement under hypocaloric conditions
• Studies of muscle preservation in simulated catabolic states or mechanical unloading
• Investigation of contractile performance and fatigue resistance under selective AR modulation
• Comparative analysis of partial versus full AR agonism in non-target tissue selectivity
• Research into bone mineral density preservation alongside anabolic activity in muscle tissue

This kit is positioned as an introductory recomposition-focused combination with the mildest selectivity profiles in the SARM category, making it suitable for research programmes prioritising tissue preservation over volumetric mass accrual.

⚠ Important Note: This product is supplied strictly for laboratory research use only. It is not approved for human consumption or therapeutic use. Not intended to diagnose, treat, cure, or prevent any disease.