How long does IGF-1 LR3 take to work?
In the first week of IGF-1 LR3, pumps and fullness in trained muscle. Mild hypoglycemia risk. Around week 4, nutrient partitioning shifts noticeably. Plateau approaching by week 4. By week 8, cycle endpoint already passed. Cycle off well before this point. Response varies between people, this is the commonly reported pattern, not a guarantee.
Week by week
- Week 1: Pumps and fullness in trained muscle. Mild hypoglycemia risk.
- Week 4: Nutrient partitioning shifts noticeably. Plateau approaching by week 4.
- Week 8: Cycle endpoint already passed. Cycle off well before this point.
References
- IGF-I and its analogs in clinical use — Clemmons DR, Endocrinol Metab Clin North Am, 2012
- Detection of His-tagged Long-R3-IGF-I in a black market product — Kohler M, Thomas A, Walpurgis K, et al., Growth Hormone & IGF Research, 2010
- Site-specific fluorescent derivatization and liquid chromatographic-mass spectrometric characterization of long R(3) IGF-I for bioanalytical applications — Harvey MD, Banks PR, Journal of Chromatography B, 2003
Pepdex is an editorial reference, not medical advice. Peptides vary in legal and approval status by country, many are research compounds without full human safety data. Talk to a qualified clinician before starting anything.
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Last updated 2026-06-06.