Extracellular Vesicles / Cell-Signalling Serum
Nanoscale vesicles, roughly 30–150 nanometres, that cells release to communicate with one another — carrying proteins, lipids and RNA messages. In skincare they're usually derived from stem cells and positioned as rejuvenation signals that lower inflammation and oxidative stress in aged or UV-damaged skin. The most credible human evidence comes from pairing them with a barrier-disrupting procedure: applied immediately after microneedling or fractional laser, where split-face studies report better scar and texture outcomes than the procedure alone.
Exosomes aren't dosed as a percentage — products report particle counts or protein load, and there is no agreed clinical standard between brands. That makes label-to-label comparison unreliable, so provenance, manufacturing quality and a certificate of analysis matter more than any single number.
Most real-world evidence is peri-procedural: applied straight after in-clinic microneedling or laser so the micro-channels aid uptake. Benefit from topical-only use on intact skin is far less certain. Many are sold freeze-dried and reconstituted, then kept cold. Regulatory caution: as of 2026 no exosome product is FDA-approved for aesthetic use, and the agency has flagged that topical or cosmetic labelling doesn't change that — so treat regenerates / stimulates-collagen marketing claims sceptically.
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