Growth factors are among the most intriguing and least understood ingredients in anti-aging, proteins that signal skin cells to repair and regenerate, and the science behind them is promising enough to justify their cost for some. They sit at the cutting edge of skincare, closer to biological repair than to the cosmetic moisturizers most people are used to, and that is both their appeal and their complication.Growth factors work by sending repair signals. They are naturally occurring proteins that tell fibroblasts to produce collagen, stimulate cell turnover, and promote the healing that keeps skin firm and resilient, and as the skin ages it produces fewer of them, which is part of why aging accelerates. Applying them topically aims to restore those signals and push the skin toward a more youthful repair state.The evidence is encouraging but mixed. Studies, including some funded by the companies selling these serums, show improvements in fine lines, firmness, and overall appearance, often over eight to twelve weeks, but independent, long-term data is still limited.
The results are generally gradual and subtle, more in line
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