This content is for educational purposes only. Not medical advice. Always consult a licensed healthcare professional before using any peptides.

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Growth HormoneHigh RiskNot FDA-approved. Research compound.

IGF-1 LR3

The Growth Accelerator

IGF-1 LR3 is a long-acting analog of insulin-like growth factor 1 with a modified structure that extends its half-life and potency. Unlike natural IGF-1, the LR3 variant resists binding to IGF binding proteins, keeping it active in circulation longer. It uniquely promotes muscle hyperplasia (creation of new muscle cells), not just hypertrophy of existing ones.

If You Take This

  • Promotes muscle hyperplasia (new muscle cell creation)
  • Extended half-life vs natural IGF-1
  • Powerful anabolic and anti-catabolic effects
  • Enhances nutrient partitioning toward muscle
  • Accelerates recovery from training
  • Promotes satellite cell activation

Protocol

Dosing
20-50mcg subcutaneous daily, preferably post-workout. Start at 20mcg to assess response. Some protocols use bi-lateral site injections near target muscles.
Cycle Length
4-6 weeks on, 4-6 weeks off. Do not run extended cycles — desensitization occurs.
Half-Life
20-30 hours (long-acting)
Best Time
Post-workout or morning
Method
Subcutaneous or intramuscular injection

Stacks Well With

MK-677 (GH support)Follistatin 344 (advanced)BPC-157 (recovery)

Avoid With

Insulin (dangerous hypoglycemia risk)Caution with other growth factorsNot for use with active cancer history

Side Effects

  • Hypoglycemia (monitor blood sugar closely)
  • Joint and connective tissue pain
  • Organ growth at high doses (intestinal)
  • Jaw and extremity growth with chronic use
  • Potential tumor promotion (theoretical)

Where to Buy

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We track prices across 5+ verified vendors so you don't have to. Every vendor is vetted for purity testing, third-party COAs, and shipping reliability.

Prices last verified: April 2, 2026

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≥99%
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$150.00
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Apollo Peptide Sciences

★ 4.6
$154.99
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30mg
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98%+
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For educational and informational purposes only. Not medical advice. Always consult a healthcare provider before starting any peptide protocol.