"Anti-ageing" is a marketing category, not a mechanism.
That distinction is worth holding onto, because it explains most of what is strange about how these products are sold — the soft verbs, the lighting in the photography, the way a jar can cost £120 and promise almost nothing if you read it closely.
What a cosmetic is allowed to do
Start with the boundary. A cosmetic may clean skin, protect it, keep it in good condition, perfume it, and improve its appearance. It may not claim to treat, cure, or prevent anything. A product that genuinely altered the biology of ageing would not be a cosmetic at all — it would be a medicine, with trials behind it, a licence, and a leaflet listing what it does to people who take it.
So every product sold on ageing is working inside that boundary, whether or not the copy admits it. The honest ones talk about the appearance of fine lines and leave it there. The rest imply structural reversal and rely on you reading the front of the box rather than the back.
None of which makes the category a con. It means the useful question isn't whether something reverses ageing — nothing does — but what it plausibly changes, and for how long.
Sun protection is the exception
Not a serum, not a peptide complex. A sunscreen, worn on ordinary days.
Ultraviolet light is the largest external influence on how skin looks over decades. UVA reaches the dermis, where it degrades collagen and elastin and disturbs the cells that produce pigment. The damage accumulates quietly, including on grey days and through car windows, and it surfaces as slackness, uneven tone, and coarse texture — concentrated on the planes that face the sky, so the forehead, nose, cheekbones, ears, and back of the neck. Compare the skin on a man's forearm with the skin on his hip sometime. The difference between them is not age.
This is the one place in skincare where being emphatic is justified, because the evidence is not mixed. Doers of London doesn't make a sunscreen, so read that as a recommendation rather than a pitch.
What the actives can plausibly do
A short and honest map of the rest.
Retinoids. Vitamin A derivatives that bind to receptors in skin cells and change how those cells behave — quicker turnover at the surface, and signalling that influences collagen production beneath it. They have been studied for decades, which is more than most of the category can say. They also irritate, which is why how slowly you introduce one matters more than the number on the label.
Vitamin C and other antioxidants. UV exposure generates reactive oxygen species, and antioxidants mop up a share of them. Sensible alongside sun protection rather than instead of it. Formulation does the real work, because most forms oxidise readily — if your serum has turned amber, it has already aged on your behalf.
Humectants and moisturisers. Water held in the outer layer makes cells sit flatter, and a level surface makes fine lines read as shallower and the whole face as more rested. This is real, and visible the same day. It is also temporary, which is the part worth saying out loud: you are changing the optics, not the collagen underneath.
Peptides. Plausible mechanisms, considerably thinner human evidence than the marketing implies. Not a waste of money inside a good formula, but rarely the reason a good formula works.
What no cream does
Three things worth being blunt about.
It doesn't restore volume. A good deal of what reads as an older face is fat redistribution, bone remodelling, and muscle — architecture rather than surface. Nothing applied to the outside reaches it.
It doesn't undo accumulated photodamage. Appearance can improve; collagen degraded across 20 summers does not reassemble on request.
And it doesn't outrun your exposure. A retinoid at night and no protection by day is an expensive way to stand still.
How to read the jar
- "Clinically proven" often means a panel of volunteers agreed their skin felt smoother. That is a perception study, not a measurement.
- A percentage on the front tells you concentration. It tells you nothing about stability, delivery, or whether the rest of the formula lets the ingredient work.
- Any promise with a deadline attached — a fortnight, 28 days — is selling a timetable your skin never agreed to.
- Before-and-after photography is lit, and the man in the second photograph has usually just shaved and moisturised.
What actually holds up is duller than the category would like: protection from the sun, a barrier kept in good condition, one active you can tolerate, and months rather than weeks of using it. The rest is refinement, and most of it is optional.
One thing that isn't cosmetic. Any patch of skin that changes shape or colour, bleeds, or doesn't heal belongs in front of a GP rather than on a shelf of products, and sooner rather than later.