Growth factors

ProteinGrowth factorBest taken away from food

What is it

Growth factors in supplement labels usually refer to bioactive signaling proteins found in colostrum, deer antler velvet, or other animal-derived products. Examples include IGF-1, TGF-beta, and EGF.

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Recovery and athletic performance

Mixed Evidence

Marketing claims for muscle and recovery benefits are not well supported by oral bioavailability data or rigorous clinical trials.

How it works

Growth factors are protein hormones that promote cell growth, proliferation, and differentiation. In their natural sources, they help newborns or growing animals develop tissue. The question for oral supplements is whether intact proteins survive gastric digestion to reach systemic circulation in active form. Large proteins like IGF-1 are largely digested in the gut, with only a small fraction (if any) reaching the bloodstream intact. Most claimed effects of growth factor supplements are therefore unlikely to come from direct delivery of intact peptides.

Dosage

There is no validated dose. Colostrum supplements typically deliver 1 to 5 g of bovine colostrum per serving; deer antler products vary widely.

When and how to take it

Most commonly taken on an empty stomach or before workouts.

2 commercial forms

Compare the main delivery options and what they’re best suited for.

Bovine colostrum

Used for immune and gut health applications with modest clinical evidence.

Most peptides digested; some immunoglobulins survive locally in the gut.

Deer antler velvet

Marketed for athletic recovery; WADA-prohibited for some athletes.

Oral bioavailability of intact IGF-1 is essentially nil.

Safety

Generally tolerated at typical doses. Sourcing matters for animal-derived products; choose tested suppliers. Concerns about IGF-1 and cancer risk apply more to injected forms than to oral supplements.

Who should be cautious

Avoid in pregnancy, lactation, and history of hormone-sensitive cancer. Athletes should check WADA status of deer antler products, which can trigger positive doping tests due to IGF-1 content.

Interactions

Theoretical interactions with growth hormone therapy or fertility medications.

Frequently asked questions

Do oral growth factors actually work?⌄

Direct delivery of intact growth factor proteins through oral supplements is unlikely due to gut digestion. Any benefits are more plausibly from amino acid and nutrient content.

Are growth factor supplements safe?⌄

Generally tolerated, but verify sourcing and avoid in hormone-sensitive cancer history.

References

Growth factors on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Growth factors (PubMed search) — PubMed link

Track Growth factors with Pilora

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.