IGF-1 (Insulin-like Growth Factor 1) is a powerful anabolic growth factor – a hormone naturally produced in the liver in response to growth hormone (GH) stimulation. It is a core term in our SARMs glossary.
Colostrum and certain milk peptides – naturally contain small amounts of IGF-1
None of these should be used casually – they alter endocrine systems and carry side effect profiles.
Key Takeaways
IGF-1 is a growth-regulating hormone activated by GH
It promotes muscle repair, skin health, bone density, and more
High IGF-1 = anabolic, but long-term overexpression may raise cancer risk
Compounds like MK-677 and GH peptides raise IGF-1 levels
IGF-1 is powerful – and shouldn’t be boosted recklessly
FAQ about IGF-1 (Insulin-Like Growth Factor 1)
Is IGF-1 a steroid? No. It’s a peptide hormone, not an anabolic steroid. It acts via the IGF-1 receptor – not the androgen receptor.
What does IGF-1 do in the body? It helps build muscle, strengthen bone, repair tissues, and support metabolism – especially under the influence of growth hormone.
Can you increase IGF-1 naturally? Yes – via sleep, training, protein intake, and blood sugar control. GH-releasing stimuli also help.
Is IGF-1 safe to take? Endogenous (natural) IGF-1 is essential. However, long-term artificial elevation can pose risks, including potential cancer promotion.
Does IGF-1 affect skin and aging? Yes. It supports collagen synthesis, skin thickness, and wound healing – making it of interest in anti-aging protocols.
Nick Paul Taylor is a freelance reporter covering the global biopharma industry. Nick specialises in pharmaceutical research, biotechnology, drug regulation and medical technology, and has written for Fierce Pharma, Fierce Biotech and Endpoints News for fifteen years. Nick is a biology graduate of the University of York.
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Glossary: What is IGF-1 (insulin-like growth factor 1)
By Nick Paul Taylor
Published · Updated · 3 min read
IGF-1 (Insulin-like Growth Factor 1) is a powerful anabolic growth factor – a hormone naturally produced in the liver in response to growth hormone (GH) stimulation. It is a core term in our SARMs glossary.
It plays a central role in:
Think of IGF-1 as the execution arm of growth hormone – GH gives the signal, IGF-1 gets the work done.
How IGF-1 Works (The Biological Pathway)
IGF-1 also enhances nutrient uptake, including amino acids and glucose, into muscle tissue.
Why Is IGF-1 Important?
IGF-1 is essential for normal human growth and recovery, especially during adolescence. In adults, it continues to regulate:
It also supports brain function, nerve regeneration, and immune modulation – making it relevant far beyond just fitness.
IGF-1 and Anabolism: Why Athletes Care
In performance circles, IGF-1 is sought after because of its:
It’s also central to how SARMs, GH peptides, and MK-677 (Ibutamoren) exert part of their effects.
IGF-1 vs Growth Hormone (GH): What’s the Difference?
Bottom line: GH gives the command – IGF-1 carries it out.
What Increases IGF-1 Naturally?
IGF-1 levels are often reduced in aging, calorie restriction, or chronic illness – which is why it’s explored in anti-aging and longevity research.
IGF-1 and Cancer Risk: The Double-Edged Sword
While IGF-1 promotes healthy tissue growth, excessive IGF-1 can also fuel unwanted cell proliferation – including cancer cells.
Epidemiological studies link very high IGF-1 levels with increased risk of:
This doesn’t make IGF-1 inherently dangerous – but it means context and control matter. Chronic elevation = risk.
IGF-1 in Supplements and Research
Some compounds used in research settings aim to increase IGF-1, including:
None of these should be used casually – they alter endocrine systems and carry side effect profiles.
Key Takeaways
FAQ about IGF-1 (Insulin-Like Growth Factor 1)
No. It’s a peptide hormone, not an anabolic steroid. It acts via the IGF-1 receptor – not the androgen receptor.
It helps build muscle, strengthen bone, repair tissues, and support metabolism – especially under the influence of growth hormone.
Yes – via sleep, training, protein intake, and blood sugar control. GH-releasing stimuli also help.
Endogenous (natural) IGF-1 is essential. However, long-term artificial elevation can pose risks, including potential cancer promotion.
Yes. It supports collagen synthesis, skin thickness, and wound healing – making it of interest in anti-aging protocols.
Nick Paul Taylor · Freelance
Freelance biopharma reporter
Nick Paul Taylor is a freelance reporter covering the global biopharma industry. Nick specialises in pharmaceutical research, biotechnology, drug regulation and medical technology, and has written for Fierce Pharma, Fierce Biotech and Endpoints News for fifteen years. Nick is a biology graduate of the University of York.
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