MGF (Mechano Growth Factor)

MGF (Mechano Growth Factor) is a splice variant of IGF-1 that the body naturally releases in muscle tissue after mechanical loading, such as resistance training. Synthetic MGF mimics that local signal, which is why it is typically injected directly into the muscle that was just trained rather than used as a whole-body peptide. This is a guide to how it is commonly used, not medical advice.

A common starting point is 200 mcg injected into the specific muscle worked, straight after training, 3 to 4 times per week, with 400 mcg per session as an upper limit some users work up to. Runs are usually kept short, around 4 to 6 weeks, followed by a break of similar length before repeating. Treat this as a general guide rather than a fixed protocol, everyone responds differently.

No. MGF is not a hormone replacement and does not work through the same pathway as anabolic steroids, so on its own it does not suppress natural testosterone production. Most people don't run a PCT or a testosterone base for MGF specifically. If other compounds are added to a stack that do affect natural hormone output, plan a PCT around those, not around the MGF.

The most commonly reported issues are soreness at the injection site, some water retention in the muscle that was injected, and an increase in appetite. At the doses typically used, people don't report effects outside the injected area. Start on the lower end and see how your body responds before increasing frequency or dose.

Some users run MGF alongside cardarine (GW-501516), which is a PPAR-delta agonist rather than a SARM, mainly for its effect on endurance and lipid profile during training blocks. If oral compounds are added to a stack later, a liver support product is worth having on hand as general good practice. Keep any stack simple to start so you can tell what's actually doing what.

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