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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.
TL;DR: Argireline is the peptide that launched the topical-Botox marketing genre. The original Blanes-Mira 2002 paper showed wrinkle reduction in 10 women.…
A friend sent me a TikTok in February that claimed snail mucin was “just an expensive moisturiser” and that hyaluronic acid would…
A friend asked me last winter why her new polyglutamic acid serum, marketed as the “next-generation hyaluronic acid,” made her face feel…
TL;DR: When a serum lists ‘Lactobacillus ferment lysate,’ four manufacturing steps have happened and you cannot tell which one was the primary…
TL;DR: Lactobacillus ferment lysate and Bifida ferment lysate are the two postbiotics dominating K-beauty essences. They are not the same ingredient. Lactobacillus…
TL;DR: There is exactly one well-cited head-to-head trial of bakuchiol versus retinol in humans, Dhaliwal 2019, with 44 participants and 12 weeks…
TL;DR: Retinization is a 12 to 16 week neurological and structural reset, not a side effect to push through. Weeks 1-2: receptor…
TL;DR: Retinol is sold as something everyone over twenty-five needs forever. The honest answer is that some people should stop, some should…
TL;DR: Probiotic skincare almost never contains live organisms. Postbiotic skincare contains the fermentation byproducts and lysates that actually survive a cosmetic shelf…
TL;DR: Peptides are short chains of amino acids that can signal cellular activity. There are over a hundred branded peptide compounds in…
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.