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Category
Know exactly what's in the bottle and why it matters.
Quick answer
The Ingredients library is the most thorough English-language reference for skincare actives we know how to build. Each entry breaks down what an ingredient is, the mechanism by which it works, the clinical evidence behind it, who should and shouldn't use it, and how to layer it without canceling other actives.
Retinol, retinal, tretinoin, bakuchiol — every option, decoded.
Every form of vitamin C — LAA, SAP, MAP, THD, glucoside.
The all-rounder vitamin B3, properly explained.
Signal, carrier, neuropeptides — and which actually work.
The exfoliant family from gentlest to strongest.
Hyaluronic acid, glycerin, polyglutamic acid, beta-glucan.
Barrier-repair lipids the skin actually uses.
Pre/pro/postbiotics, ferments, and biome-friendly botanicals.
PDRN, exosomes, EGF, snail mucin, propolis, galactomyces.
Mineral, chemical, and what's actually FDA-approved in the US.
sh-Polypeptide-50 is a recombinant growth factor showing up across 2026 launches. Here is what it does, where the evidence is strongest and…
Lactobacillus rhamnosus is celebrated as a gut probiotic. Topically the evidence is narrower. Here is what trials show for redness, barrier and…
Vitreoscilla filiformis is a thermal-water bacterium used in soothing creams for atopic skin. Here is the calming evidence, and where to spot…
Roseomonas mucosa is a live-bacterial therapy currently in early eczema trials. Here is what NIH research has shown so far, and why…
Streptococcus mitis bridges mouth and lip microbiomes. Lip balms, mouthwash and perioral derm all interact with it. Here is why slow lip…
Lactobacillus crispatus is famous for vaginal microbiome health. New research is exploring topical facial use. Here is what's real and what's still…
Corynebacterium kroppenstedtii is over-represented in rosacea skin. Here is what dermatology research suggests, and why barrier-first routines may help.
Malassezia restricta is a lipid-loving yeast that thrives in oily zones. It links to dandruff, seb derm and fungal acne. Here is…
Not every C. acnes strain triggers breakouts. Some protect skin. Phylotypes IA1, IB and II behave differently. Here's what 2025 research means…
Staphylococcus epidermidis isn't a pathogen on healthy skin. It's a microbiome ally that crowds out S. aureus and quietly trains barrier immunity.
Modern skincare is an ingredient game. Brand names matter less than the molecules inside the bottle, and the brands that succeed are the ones that explain those molecules honestly. The Ingredients library exists because nobody else is doing this work at the depth and clarity it deserves.
Ten subcategories cover the whole field: Retinoids & Bakuchiol (the cell-turnover family), Vitamin C (every form, from L-ascorbic acid to ascorbyl glucoside), Niacinamide, Peptides, Acids (AHA, BHA, PHA), Hydrators (hyaluronic acid, glycerin, polyglutamic acid), Ceramides & Lipids, Microbiome Ingredients (pre/pro/postbiotics, ferments), Korean & Biotech Actives (PDRN, exosomes, snail mucin), and Sunscreen Filters.
Every entry follows the same structure. A 60–90 word quick-answer up top so you can leave with the key facts in 30 seconds. Then the science, in plain English. Then the clinical evidence, with citations and publication dates so you can verify. Pairing rules, side effects, who should avoid, recommended concentrations, and which forms are FDA-approved in the US.
Elelaf is FDA-approved and manufactured in South Korea — the world's most innovative skincare lab ecosystem. We pay close attention to which ingredients are approved where, and which are still under regulatory review (looking at you, exosomes). Our ingredient pages will always tell you the regulatory status, not just the marketing claim.