Growth factors

What it is

Growth factors are signaling proteins that tell cells to divide, migrate, or produce extracellular matrix. In skincare the common ones are EGF (epidermal growth factor), TGF-β, FGF, IGF, and VEGF, sometimes labeled by source (human conditioned media, plant-derived, fermented).

What it does

• Stimulates fibroblast and keratinocyte activity in vitro.
• Accelerates wound closure in clinical wound-care contexts.
• May support post-procedure recovery and improve fine line and tone outcomes over months.

Evidence strength

Emerging. In-vitro and clinical wound studies are robust; cosmetic-grade RCTs are small, often manufacturer-funded, and limited in penetration analysis. Growth factors are large molecules — getting them through intact skin in active form is the hard part.

Best for

• Post-procedure recovery — microneedling, lasers, peels, where the barrier is open.
• Adjunct to retinoids for mature skin.
• Users with active healing needs (e.g., post-surgical scars, per provider).

Who should avoid it

• Anyone with a personal or family history of skin malignancy — discuss with a dermatologist. Growth factors signal cell division and the long-term safety on damaged skin is not fully characterized.
• People who can't tell the difference between a well-made formula and an unstable one — this category has wide quality variance.

Ideal concentration range

Hard to evaluate from a label. Bioactivity, not weight percent, determines effect. Look for brands that publish potency, source, and stability data — not just an ingredient name.

Best ingredient pairings

• Peptides — complementary signaling.
• Ceramides + hyaluronic acid — barrier-supportive vehicle.
• Vitamin C, niacinamide — broadly compatible.

Ingredients to avoid combining

• Low-pH AHAs in the same layer — protein actives denature at extremes of pH.
• Heat exposure — store cool, avoid leaving in a hot car.

Pregnancy considerations

Data is limited. Most providers advise caution and prefer better-characterized alternatives (peptides, niacinamide, vitamin C, azelaic acid) during pregnancy. Confirm with your provider.

Irritation potential

Low. Most reactions are to preservatives or co-formulated actives. Some "stem cell extract" marketing terms describe peptide-like fragments rather than true growth factors.

Beginner guidance

1. Wait until you have a stable barrier and a clear baseline routine before adding.
2. Use at night, before moisturizer.
3. Give 8–12 weeks; document with photos.

Advanced guidance

• Use post-microneedling and post-procedure for first few days under a provider's protocol.
• Choose brands that disclose source, potency assay, and stability data.
• Avoid stacking 3+ "high-tech" actives at once — you'll never know what worked.

Best products containing it

Research notes

• Fitzpatrick & Rostan — initial photoaging studies on growth factor blends.
• Topical EGF in burn and post-laser care has substantial wound-healing literature.
• Independent reviews caution against extrapolating in-vitro findings.

Related

• Peptides
• Exosomes
• Microcurrent devices