PinnyPeptide

IGF-1 DES vs IGF-1 LR3

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

IGF-1 LR3

Muscle Growth

Long-acting IGF-1 analog with reduced binding-protein affinity for sustained signaling.

Typical vial

1 mg

Typical dose

20-100 mcg

Half-life

~20-30 minutes

FDA status

Not FDA approved.

Typical vial

1 mg

Typical dose

20-50 mcg

Half-life

~20-30 hours

FDA status

Not FDA approved. Native recombinant rhIGF-1 (mecasermin/Inc…

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

IGF-1 LR3 effects

  • Sustained IGF-1 receptor activation (20-30 hour half-life)
  • Muscle cell hyperplasia (increased cell number, not just size)
  • Anabolic signaling via PI3K-Akt-mTOR pathway
  • Improved nutrient partitioning toward muscle
  • Enhanced recovery from training-induced damage

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

IGF-1 LR3 side effects

  • Hypoglycemia (real risk — IGF-1 has insulin-like activity)
  • Joint pain and stiffness
  • Carpal tunnel-like symptoms
  • Lethargy / lightheadedness from glucose drops
  • Possible tumor-promoting effects (theoretical, dose-dependent)
  • Localized lipohypertrophy or muscle asymmetry with site injection

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

IGF-1 LR3 dosing ranges

Research / muscle hypertrophy

20-50 mcg · Once daily (SubQ or IM), pre- or post-workout · 30-50 days per cycle

Site-specific injection (research)

20-40 mcg per site · Into trained muscle, post-workout · 30-50 days per cycle

Full IGF-1 DES guide → Full IGF-1 LR3 guide →

IGF-1 DES vs IGF-1 LR3 — common questions

What is the difference between IGF-1 DES and IGF-1 LR3?

IGF-1 DES: Truncated IGF-1 variant — site-specific, short-acting muscle growth signal. Typical dose 20-100 mcg. IGF-1 LR3: Long-acting IGF-1 analog with reduced binding-protein affinity for sustained signaling. Typical dose 20-50 mcg. Both fall under the Muscle Growth category.

Can you stack IGF-1 DES and IGF-1 LR3?

Stacking IGF-1 DES with IGF-1 LR3 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 IGF-1 LR3?

IGF-1 DES is typically dosed: Into trained muscle post-workout (IM) for Site-specific muscle hypertrophy; Once daily (SubQ) for General anabolic support. IGF-1 LR3 is typically dosed: Once daily (SubQ or IM), pre- or post-workout for Research / muscle hypertrophy; Into trained muscle, post-workout for Site-specific injection (research).

Are IGF-1 DES and IGF-1 LR3 FDA approved?

IGF-1 DES: Not FDA approved. IGF-1 LR3: Not FDA approved. Native recombinant rhIGF-1 (mecasermin/Increlex) is FDA approved for severe primary IGF-1 deficiency in children, but IGF-1 LR3 itself is not.

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