How long does IGF-1 DES take to work?
In the first week of IGF-1 DES, pumps and fullness in trained muscle. Around week 4, site-specific tightness near worked muscle. Cycle endpoint, stop. By week 8, off-cycle. Reassess. Response varies between people, this is the commonly reported pattern, not a guarantee.
Week by week
- Week 1: Pumps and fullness in trained muscle.
- Week 4: Site-specific tightness near worked muscle. Cycle endpoint, stop.
- Week 8: Off-cycle. Reassess.
References
- Insulin-like growth factor-I (IGF-I) and especially IGF-I variants are anabolic in dexamethasone-treated rats — Tomas FM, Knowles SE, Owens PC, et al., Biochemical Journal, 1992
- Mechanisms of IGF-1-Mediated Regulation of Skeletal Muscle Hypertrophy and Atrophy — Yoshida T & Delafontaine P, Cells, 2020
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.