Growth factors in skin care are proteins that send signals to your cells telling them to repair, multiply, and produce structural components like collagen and elastin. Your body makes these proteins naturally, and they play a central role in wound healing and tissue maintenance. In cosmetic products, lab-made versions of these same proteins are applied topically with the goal of slowing visible aging and improving skin texture.
How Growth Factors Work in Your Skin
Think of growth factors as chemical messengers. Each one is a small protein that docks onto a specific receptor on the surface of a skin cell, like a key fitting into a lock. Once that connection is made, it triggers a cascade of activity inside the cell: the cell may begin dividing, producing collagen, building elastin fibers, or migrating to fill in a wound.
In younger skin, these signals fire frequently and efficiently. As you age, your body produces fewer growth factors and your cells become less responsive to them. The result is slower cell turnover, less collagen production, and the gradual thinning and wrinkling that characterize aging skin. Skincare products containing growth factors aim to supplement that declining supply from the outside.
The Main Types You’ll See on Labels
Most growth factor products feature one or more of three key proteins:
- Epidermal growth factor (EGF) regulates cell survival, proliferation, and migration. It promotes the formation of new skin surface cells, stimulates blood vessel growth, and increases the production of both collagen (types 1 and 3) and elastin. EGF also has anti-inflammatory properties, reducing the expression of inflammatory markers in skin tissue.
- Fibroblast growth factor (FGF) targets fibroblasts, the cells responsible for building your skin’s structural scaffolding. FGF signaling regulates proliferation, survival, migration, and differentiation at the cellular level, and plays a role in elastin formation.
- Transforming growth factor-beta (TGF-beta) is involved in collagen synthesis and tissue remodeling. Your skin produces it naturally during repair, and EGF actually boosts its expression, meaning these growth factors often work in concert rather than isolation.
Where They Come From
The growth factors in your serum aren’t harvested from human skin. Most are recombinant proteins, meaning they’re produced by engineering bacteria, plant cells, or other organisms to manufacture a human-identical protein. The three most common sources are bacterial cells (typically E. coli), animal cells, and increasingly, plant-based systems.
Plant-derived growth factors have gained traction because they’re cost-effective, carry a lower contamination risk, and can be scaled up quickly. Research comparing plant-derived and bacteria-derived versions of FGF2 found no significant difference in biological activity. Both maintained identical cell behavior, gene expression, and differentiation capacity, suggesting the source matters less than the final protein structure.
You’ll also see products marketed as containing “stem cell growth factors,” which typically use proteins secreted by cultured human fibroblasts or mesenchymal stem cells rather than the stem cells themselves.
What the Clinical Evidence Shows
In a randomized, double-blind clinical trial published in The Journal of Clinical and Aesthetic Dermatology, participants applied topical growth factor products for three months. A blinded evaluator assessed wrinkle improvement at 29 to 41 percent and skin texture improvement at about 40 percent. The participants themselves reported slightly higher numbers, rating wrinkle improvement between 38 and 46 percent and texture improvement between 49 and 54 percent. The trial compared a fibroblast-derived growth factor product against a mesenchymal stem cell-derived product and found no statistically significant difference between the two.
These are meaningful numbers for a topical product, though they reflect improvements measured under controlled conditions with consistent daily use. In practice, most people notice improved hydration and a subtle glow within the first few weeks. More significant changes, like firmer skin and reduced fine lines, typically develop over 8 to 12 weeks as collagen production and cellular turnover build over time. Results are gradual and cumulative.
The Stability Problem
Growth factors are proteins, and proteins are fragile. EGF, for example, is a small molecule (about 6,200 daltons) with three internal bonds holding its shape together. In liquid formulations, it’s vulnerable to breakdown through water-driven degradation and oxygen exposure. Research on EGF stability found that drying the protein can reduce its degradation rate by 70 to 100 times compared to keeping it in a water-based solution.
This is why formulation matters enormously with growth factor products. Look for packaging that minimizes air and light exposure, like airless pumps or single-use ampoules. Some brands use freeze-dried delivery systems for this reason. A growth factor serum sitting in a clear jar on your bathroom counter is likely losing potency faster than one in an opaque, sealed dispenser.
How to Use Growth Factors in a Routine
Growth factor serums are water-based and lightweight, so they go on clean skin before heavier products. Apply them after cleansing and any toner, but before oils, moisturizers, and sunscreen. Because they’re proteins, they absorb best when nothing is blocking their path to the skin’s surface.
Growth factors pair well with retinol. The two work through complementary mechanisms: retinol accelerates cell turnover and thins the outer skin layer (which can actually help growth factors penetrate), while growth factors stimulate the healing and collagen production that support skin during retinol use. Dermatologists consider them an effective combination for anti-aging routines, with the growth factors boosting the brightening and smoothing benefits of retinol.
Vitamin C is another compatible active, though you may want to apply them at different times of day to avoid overloading your skin. Growth factors in the morning (under sunscreen) and retinol at night is a common approach.
Safety Considerations
The most common concern people raise about growth factors is logical: if these proteins tell cells to grow and multiply, could they encourage abnormal cell growth? It’s a reasonable question, but the current evidence is reassuring for topical cosmetic use. The concentrations in skincare products are low, and growth factors are large molecules that don’t penetrate deeply past the outer skin layers. EGF’s anti-inflammatory properties, including its ability to reduce the expression of key inflammatory signals, suggest it modulates rather than simply accelerates cell behavior.
That said, growth factor products are not well studied in people with active skin cancers or precancerous lesions. If you have a history of skin cancer, it’s worth discussing topical growth factors with a dermatologist before adding them to your routine. For the general population using them for anti-aging purposes, no significant safety signals have emerged in the published literature.