Growth Factors (TNS)
A complex of signaling proteins secreted by cultured human skin cells, the hero ingredient of prestige "growth-factor" serums, studied for the appearance of firmness and fine lines. The conditioned media is collected from fibroblasts (the cells that produce collagen and elastin) grown in culture, then formulated as a cocktail of proteins and peptides rather than a single isolated active. It sits at the higher end of the market, and because it is a proprietary, multi-protein extract, the exact composition and dose are rarely disclosed on the label.
Studied for
- ·The appearance of fine lines and wrinkles
- ·The look of firmness and texture
- ·Supporting the visible look of skin recovery after environmental stress
How it’s thought to work
Studied as a blend of signaling proteins associated with supporting the appearance of skin renewal, drawing on the same cell-to-cell communication fibroblasts use during natural tissue repair. Effects are highly formulation-specific because conditioned media varies by cell line, culture conditions and processing, and the exact level of any single protein in the mix is proprietary. That makes it harder to compare one "growth factor" product against another the way a single, named active can be compared.
In a pilot study, twice-daily topical growth factor gel was linked to smoother-looking skin and fewer visible fine lines after 60 days.
Reversal of photodamage with topical growth factors: a pilot study. Journal of Cosmetic Laser Therapy, 2003.
View on PubMed (PMID 12745596) ↗Questions
- Do growth-factor serums work?
- There is a moderate body of cosmetic research on the appearance of fine lines, though much of it is brand-sponsored and results are specific to each finished formula rather than to "growth factors" in general.
- Why are growth-factor serums usually expensive?
- Producing conditioned media from cultured human cells is a more involved manufacturing process than blending a single synthesized peptide, and the category is positioned at the prestige end of the market. Price on its own is not a reliable stand-in for how well a specific formula performs.
- Is this ingredient safe to use daily?
- Most growth-factor serums are formulated as a daily leave-on step, similar to a treatment serum. Because the active is light-sensitive and the exact composition is proprietary, following the specific product’s instructions matters more than with single, well-characterized actives.