Side-by-Side Comparison · 2026

IGF-1 DES vs Somatropin

IGF-1 DES vs Somatropin — mechanism, half-life, dosing, and research status compared. Which is right for your protocol?

IGF-1 DES
Growth Hormone & IGF

IGF-1 DES (des(1-3)IGF-1) is a naturally occurring truncated form of IGF-1, produced endogenously in the brain and other tissues, that lacks the first three N-terminal amino acids (Gly-Pro-Glu) of full-length IGF-1. This truncation eliminates its binding to IGF-binding proteins (...

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Somatropin
Growth Hormone & IGF

Somatropin is recombinant human growth hormone (rhGH) - a 191 amino acid protein identical to endogenous pituitary GH, produced via recombinant DNA technology. It is FDA-approved for multiple indications including pediatric and adult growth hormone deficiency, Turner syndrome, HI...

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Key Parameters
Parameter IGF-1 DES Somatropin
Category Growth Hormone & IGF Growth Hormone & IGF
Research Research Use FDA Approved
Half-Life 20–30 minutes (shorter than IGF-1 LR3) ~3–4 hours (SubQ); ~20 min (IV)
Typical Dose 50–100 µg 0.1–0.3 mg/day (GHD); up to 2 mg/day (clinical indications)
Frequency 1–2x daily (peri-workout) Daily or 6 days/week
Route Subcutaneous / Intramuscular (local) Subcutaneous / Intramuscular
FDA Status Not Approved Approved

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Frequently Asked Questions
What is the difference between IGF-1 DES and Somatropin?
IGF-1 DES: IGF-1 DES (des(1-3)IGF-1) is a naturally occurring truncated form of IGF-1, produced endogenously in the brain and other tissues, that lacks the first three N-terminal amino acids (Gly-Pro-Glu) of ful... Somatropin: Somatropin is recombinant human growth hormone (rhGH) - a 191 amino acid protein identical to endogenous pituitary GH, produced via recombinant DNA technology. It is FDA-approved for multiple indicati...
Which has a longer half-life, IGF-1 DES or Somatropin?
IGF-1 DES half-life: 20–30 minutes (shorter than IGF-1 LR3). Somatropin half-life: ~3–4 hours (SubQ); ~20 min (IV).
Can you stack IGF-1 DES and Somatropin?
IGF-1 DES and Somatropin are in the same category and used together in research protocols. Always consult relevant literature and follow appropriate guidelines.

For research use only. Not medical advice. ASCEND does not conduct or endorse any specific research protocol. Always consult relevant scientific literature and regulatory guidelines.