Ingredients + Mechanisms
The claim, the mechanism, the evidence, the burden — for one ingredient at a time.
This is the index for Vanity or Vice’s single-ingredient files: the same claim → mechanism → evidence → burden → verdict method used everywhere else on this site, run against one active, one lipid, one peptide, one trend ingredient at a time. No entry here treats an ingredient’s résumé as proof of what a specific bottle does. Concentration, vehicle, and the finished formula still have to show up and do the work.
New entries are added as they’re judged. Start with the label-reading piece below if you want the method before the ingredients.
Start here
Read the list before you trust it.
Method
Ingredient-List Literacy
The ingredient list confirms identity. It does not confirm concentration, formula quality, or penetration — and there is no visible 1% line on the package, however hard the internet has tried to draw one.
Actives & acids
Exfoliants, brighteners, and the acids doing real clinical work.
Pigment & acne
Azelaic Acid
Randomized trial data for acne, papulopustular rosacea, and certain pigment issues — a genuine evidence base many trend ingredients still lack. Concentration and vehicle still decide whether a given bottle earns it.
Exfoliation
Glycolic Acid
The smallest, most-studied AHA. Strong evidence for texture and brightness — and a real irritation and barrier-compromise risk that the shelf tends to understate.
Antioxidant
L-Ascorbic Acid (Vitamin C)
The ingredient has credible photoaging and pigment evidence. The retail decision is harder: concentration, pH, vehicle, packaging, oxidation, and finished-product testing decide how much of that evidence survives the bottle.
Retinoid alternative
Bakuchiol
One well-designed head-to-head trial against retinol is real evidence. It does not make bakuchiol an equivalent “plant retinol” across the board — and being non-retinoid does not establish pregnancy safety.
Melasma & pigment
Topical Tranexamic Acid
Several randomized trials support topical TXA for melasma, including comparisons with hydroquinone. One vehicle-controlled trial did not show superiority, which is exactly why concentration, route, formula, and sunscreen belong in the verdict.
Barrier & hydration
The lipids, humectants, and calming actives that hold water in and irritants out.
Barrier lipid
Ceramides
Not a fancy humectant — mortar between the cells, alongside cholesterol and free fatty acids. Real evidence for hydration and barrier support; no tidy rule that “ceramide” always beats a plain emollient.
Generalist
Niacinamide
A genuine multi-tasker with human data behind barrier support, oil control, and tone. Four times the concentration is not four times the result — 20% is a label number, not an efficacy multiple.
Humectant
Hyaluronic Acid
A real water-binding polymer with randomized human data behind hydration and elasticity. Not a syringe you can apply yourself — the “filler in a dropper” pitch oversells what a topical does.
Barrier support
Beta-Glucan
More direct human topical evidence than most 2026 trend ingredients — including a split-face post-laser trial. “Beta-glucan” is a family name, though; source and molecular weight change what a specific formula can do.
Barrier support
Ectoin
A microbial “extremolyte” with randomized human trials, including atopic-dermatitis data, behind hydration, barrier function, and tolerability. Not sunscreen, and not automatically better than hyaluronic acid.
Antimicrobial adjunct
Hypochlorous Acid
The antimicrobial chemistry is real and the tolerability can be useful. The strongest human record is antisepsis and wound-oriented use; direct evidence for a consumer HOCl mist as a primary acne treatment is much thinner.
Peptides & growth factors
Signaling molecules, and the difference a delivery route makes.
Copper peptide / route matters
GHK-Cu: Topical Evidence vs. Injectable Safety
Topical copper-peptide evidence is a formulation question. Injectable GHK-Cu is a different delivery and safety question with limited human data. One molecule name does not make those routes interchangeable.
Regenerative marketing
Exosome Serums & Treatments
Exosomes are real cell-to-cell signaling packages. As of 2026 there are still no FDA-approved exosome products for aesthetic use — mechanism is real, finished-product and regulatory certainty are not.
Trend & longevity ingredients
2026’s fastest-rising names, checked against what’s actually been measured.
Longevity language
NAD+ Skincare
NAD+ is real, important cellular biology. The “longevity” language on the bottle arrived well before the controlled human trials for passive topical NAD+ cosmetics did.
“Filler in a bottle”
Volufiline
A plausible adipocyte mechanism and a patent record — plus one small, manufacturer-generated breast-tissue study. Nowhere near the evidence “filler in a bottle” implies for facial volumizing.
Revival ingredient
Beef Tallow
A legitimately rich emollient and occlusive people can genuinely love on dry skin. The human evidence does not establish it as a superior barrier treatment, an acne therapy, or an eczema or psoriasis treatment.
An ingredient name is only the beginning of the question.
Every file above ends the same way this site always does: mechanism is not outcome, and an ingredient’s résumé is not a finished product’s evidence. For the method itself, open the Spa Desk and choose Claim Decoder. To see how a single ingredient fits into an actual routine, go to Routines and Ingredients.