IGF-1

IGF-1 is an endogenous signaling peptide involved in normal growth and metabolic regulation. The supplied guide discusses its relevance to muscle, skeletal tissue, and aging, but these discussions do not establish benefits from using IGF-1.

Hepatic production of IGF-1 is stimulated by growth hormone. IGF-1 transmits part of the growth hormone signal to tissues and participates in developmental processes and tissue maintenance.

Mechanistic topics covered by the notes include regulation of cellular proliferation and protein production. Its insulin-like activity also influences metabolism and provides a biological basis for concern about reduced blood glucose.

1. 01

   Molecular target

2. 02

   Cellular signal

3. 03

   Biological process

LEVEL 01 · Basic biology

A biological mechanism or molecular interaction is described. No claim about human outcomes.

Evidence levels reflect the state of documented research only. They are not rankings of popularity, quality or suitability, and a higher level never implies that a compound is an approved medicine.

The source guide presents IGF-1 as a link between growth hormone signaling and tissue growth. It suggests possible relevance to muscle recovery, bone maintenance, and age-related changes without supplying evidence sufficient to assess those proposed benefits. The guide also identifies low blood glucose, joint symptoms, swelling, and concerns about altered insulin responsiveness and atypical cellular growth.

Source: The Complete Guide to Peptides: Unlocking the Secrets to Health, Healing and Longevity — Hack Smith, Chapter 6, Introduction to Peptides (page references not verified)

Summarised in our own wording from the cited reference. The reference is a popular guide, not peer-reviewed literature; its statements are reported here as source claims rather than established facts.

Dosage, reconstitution and administration guidance is deliberately excluded from this platform.

The notes do not identify studies, participant populations, or outcomes that would establish the strength of evidence for the proposed applications. In particular, the aging-related claims and the long-term implications of additional IGF-1 exposure remain unresolved in this material.

Safety data are limited in the supplied material, and its broad reassurance about tolerability cannot be independently assessed. Reported concerns include hypoglycemia, joint discomfort, and fluid accumulation; the guide also raises longer-term metabolic and cellular-growth risks without adequately characterizing them. This information is not medical advice.

Research-stage compound unless otherwise established by a competent authority. Regulatory classification differs between jurisdictions and can change over time; nothing here indicates marketing authorisation.

Primary reference for this entry:

The Complete Guide to Peptides: Unlocking the Secrets to Health, Healing and Longevity — Hack Smith, Chapter 6, Introduction to Peptides (page references not verified)

Suggested literature search terms taken from the source. They are search starting points, not citations to specific studies.

• “IGF-1 growth hormone muscle repair”
• “IGF-1 for tissue regeneration”
• “IGF-1 clinical trials for growth and healing”

Editorial status

source reviewed

Last updated

2026-09-14

Last reviewed

2026-09-13

Language

EN