Topical Growth Factor Serums
- The claim
- Applied growth factors signal skin to rebuild collagen the way young skin does.
- The verdict
- Large molecules, an intact barrier, and small manufacturer-run studies. The mechanism has a delivery problem.
- Worth it?
- Not at the prices these carry. The money does more as a retinoid plus sunscreen.
What the evidence supports
Growth factors are proteins, and most are far too large to cross an intact stratum corneum in meaningful quantity. That does not make the claim impossible — delivery systems exist and barrier disruption changes the picture — but it does mean the burden of proof sits on the product. The available trials are small, short, mostly sponsored, and rarely compare against an active control such as a retinoid, which is the comparison that would actually be informative.
Why this entry is short
This is a graded stub. The verdict, the grade and the citations are settled and reviewed; the long-form write-up is queued behind a recorded consult-room explanation, in the order these questions actually come up in the office. The row is here now because an evidence index with twenty honest lines is more use than one with four essays and nothing else.
What this is based on
- Fabi & Sundaram, topical and injectable growth factors for skin rejuvenation — evidence levels II and III, and the gaps that remainFacial Plastic Surgery · 2014
- Fabi et al., filtrate of the secretion of Cryptomphalus aspersa on photoaged skin — randomized, double-blind, split-face trialJournal of Drugs in Dermatology · 2013
Grades describe the quality of the human evidence, not my opinion of the treatment. Where the literature changes, the grade changes and the review date moves with it.
The full guide
All guides →Botox Timing: Starting, Spacing, and What “Preventative” Really Buys You →
When to start, how often to repeat, and what the word preventative is actually describing. The mechanism is well understood; most of the confusion is about scheduling, and most of the marketing is about starting earlier.
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What changed in facial rejuvenation this week, one guide we updated, and why it matters. Written by Jay Keni, MD.