MGF (Mechano Growth Factor)

Native MGF is the raw peptide with a 5-7 minute serum half-life, so it clears almost as fast as the body's own pulse. PEG-MGF attaches a polyethylene glycol chain that shields the peptide from peptidases and stretches the half-life to hours. Native MGF is used to mimic the local post-damage pulse; PEG-MGF trades that pulse profile for systemic longevity and less frequent dosing.

Because the half-life is roughly 5-7 minutes. Researchers dose it immediately post-training and often inject directly into the muscle just worked, on the logic that MGF is a local signal and needs to reach satellite cells before peptidases clear it. This is the single biggest reason PEG-MGF exists: unmodified MGF is gone before it can travel far.

The endogenous story is solid. MGF was cloned from stretched muscle [1], its splice pattern tracks mechanical loading in animals [2,3], and human biopsies show MGF mRNA rising after heavy resistance exercise in young but not older subjects [4]. The injectable synthetic peptide is a different question: there are no published human trials of exogenous MGF. Claims about injected MGF building muscle are extrapolated from gene-expression and rodent data, not from clinical outcomes.

200-400mcg post-workout is the common research protocol, injected locally into the trained muscle or subcutaneously nearby, on non-rest days or only after training sessions. Dosing is entirely empirical. No human dose-response work exists, and the very short half-life means most of an injected dose is degraded quickly regardless of amount.

Bacteriostatic water is the standard diluent. For a 2mg vial, 2mL of BAC water gives 1mg/mL, so 200mcg sits in 0.2mL. Add the water slowly down the vial wall, swirl gently, and never shake. Keep it refrigerated and protected from light after mixing, and use within a few weeks.

In research settings it is often paired with GH secretagogues like CJC-1295 or MK-677, which raise circulating GH and IGF-IEa, while MGF is positioned as the local satellite-cell trigger. Some protocols also run it alongside IGF-1 LR3 for longer systemic IGF-1 exposure. These combinations are theoretical constructs built on mechanism, not stacks validated in human trials.