Lean Mass (Ostarin + MK-677)

Muscle

Components

Ostarine (MK-2866)Moderate evidence MK-677 (Ibutamoren)Moderate evidence

Rationale

The most common "first stack" in the community: a SARM for direct anabolic signaling + a GH secretagogue for recovery, sleep and appetite. The idea is to cover two independent anabolic pathways without injections.

Evidence level

Both components have individual human Phase II data (lean-mass gains); the combination has never been formally studied. Testosterone suppression from ostarine is not offset by MK-677.

Caution

Suppression + worsened insulin sensitivity (MK-677) + lipid changes; blood work before/after is needed. WADA-banned.