PinnyPeptide

IGF-1 DES vs MGF (Mechano Growth Factor)

Side-by-side comparison: effects, dosing ranges, side effects, regulatory status, and reconstitution.

Peptide A

IGF-1 DES

Muscle Growth

Truncated IGF-1 variant — site-specific, short-acting muscle growth signal.

Peptide B

MGF (Mechano Growth Factor)

Growth Hormone

A locally-acting IGF-1 splice variant released by muscle in response to mechanical load.

Typical vial

1 mg

Typical dose

20-100 mcg

Half-life

~20-30 minutes

FDA status

Not FDA approved.

Typical vial

2 mg

Typical dose

200-400 mcg

Half-life

~5-7 minutes (MGF); ~2-3 days (PEG-MGF)

FDA status

Not FDA approved for any indication.

IGF-1 DES effects

  • Strong acute IGF-1 receptor activation at the injection site
  • Promotes muscle cell hyperplasia (increased cell number)
  • Localized hypertrophy when injected intramuscularly
  • Faster clearance than IGF-1 LR3 (less systemic exposure)
  • Anabolic signaling via PI3K-Akt-mTOR

MGF (Mechano Growth Factor) effects

  • Activates muscle satellite cells and promotes proliferation
  • Accelerates muscle repair after mechanical damage
  • May enhance hypertrophy in response to training
  • Local action at injection site (non-pegylated form)
  • Systemic muscle and recovery signaling (PEG-MGF)

IGF-1 DES side effects

  • Localized hypertrophy / asymmetry if always injected in one site
  • Mild hypoglycemia (less than LR3)
  • Injection site discomfort or temporary muscle soreness
  • Theoretical IGF-driven proliferation concerns
  • Lipohypertrophy with repeated same-site injection

MGF (Mechano Growth Factor) side effects

  • Injection-site irritation or redness
  • Mild hypoglycemia at high doses (insulin-like effect)
  • Possible hypertrophy of non-target tissues (theoretical)
  • Limited long-term safety data in humans

IGF-1 DES dosing ranges

Site-specific muscle hypertrophy

20-50 mcg per site · Into trained muscle post-workout (IM) · 30-50 days per cycle

General anabolic support

50-100 mcg · Once daily (SubQ) · 30-50 days per cycle

MGF (Mechano Growth Factor) dosing ranges

Localized muscle repair (non-pegylated)

200-300 mcg per site · Post-workout, into the worked muscle (intramuscular) · 3-4 weeks per cycle

Systemic muscle recovery (PEG-MGF)

200-400 mcg · Twice weekly (SubQ) · 4-6 weeks per cycle

Full IGF-1 DES guide → Full MGF (Mechano Growth Factor) guide →

IGF-1 DES vs MGF (Mechano Growth Factor) — common questions

What is the difference between IGF-1 DES and MGF (Mechano Growth Factor)?

IGF-1 DES: Truncated IGF-1 variant — site-specific, short-acting muscle growth signal. Typical dose 20-100 mcg. MGF (Mechano Growth Factor): A locally-acting IGF-1 splice variant released by muscle in response to mechanical load. Typical dose 200-400 mcg. Both fall under the Muscle Growth and Growth Hormone categories.

Can you stack IGF-1 DES and MGF (Mechano Growth Factor)?

Stacking IGF-1 DES with MGF (Mechano Growth Factor) is a protocol-design question best raised with a clinician — it depends on your goal, current bloodwork, and whether both peptides target overlapping mechanisms. Both peptides should be tracked independently with separate injection sites and timing. PinnyPeptide supports multi-peptide stacks with automatic injection site rotation.

Which is dosed more frequently, IGF-1 DES or MGF (Mechano Growth Factor)?

IGF-1 DES is typically dosed: Into trained muscle post-workout (IM) for Site-specific muscle hypertrophy; Once daily (SubQ) for General anabolic support. MGF (Mechano Growth Factor) is typically dosed: Post-workout, into the worked muscle (intramuscular) for Localized muscle repair (non-pegylated); Twice weekly (SubQ) for Systemic muscle recovery (PEG-MGF).

Are IGF-1 DES and MGF (Mechano Growth Factor) FDA approved?

IGF-1 DES: Not FDA approved. MGF (Mechano Growth Factor): Not FDA approved for any indication.

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