Most of what ages skin is measurable, and most of what slows it is cheap. The expensive part is usually the marketing.
Skin is the only aging organ people can watch in a mirror, which is why it attracts more product claims than any other area of longevity. It is also one of the better-studied ones. Dermatology has decades of controlled trials, and the ranking they produce is uncomfortably simple: sun protection and retinoids carry most of the proven effect, and almost everything else is a smaller addition on top.
These guides work through the rest of the picture. Sleep and stress are not cosmetic footnotes - controlled sleep restriction measurably changes skin barrier recovery and visible signs of fatigue, and chronic stress affects wound healing. Glycation explains part of the structural story: sugars attach to collagen and elastin, form cross-links, and leave the tissue stiffer and less elastic over time, which is the mechanism behind a great deal of dietary advice that is usually stated far more confidently than the evidence allows.
Where supplements and topicals have real randomised data, the guides say so, including collagen peptides and copper peptides. Where the claim rests on a mechanism and a press release, they say that too. Every article cites its sources. None of it is medical advice, and anything persistent or changing on skin belongs with a dermatologist rather than a search engine.
Related topics: Peptides and collagen · Longevity supplements
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