Know what's inside your supplements & skincare
300 ingredient guides, written to help you read a label with more context: where an ingredient comes from, what it does, its risks, and what the evidence actually supports.
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Last updated 2026-09-26
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From essential nutrients to the ingredients on a serum label.
01
VitaminsEssential micronutrients your body needs to function16 ingredients02
MineralsElements involved in hundreds of body processes17 ingredients03
Amino Acids & ProteinsThe building blocks of muscle, skin, and enzymes29 ingredients04
Botanicals & HerbsPlant-derived ingredients used in supplements and skincare81 ingredients05
AntioxidantsCompounds that help protect cells from oxidative stress14 ingredients06
Lipids & Fatty AcidsFats and oils that build cells and carry nutrients25 ingredients07
Probiotics & DigestiveLive microorganisms and ingredients for gut health22 ingredients08
Skin ActivesIngredient superstars that change how skin behaves27 ingredients09
Humectants & EmollientsIngredients that attract and hold moisture20 ingredients10
Preservatives & StabilizersKeeping products safe and stable8 ingredients11
Surfactants & EmulsifiersIngredients that let water and oil mix — and clean11 ingredients12
Other IngredientsEverything else you will see on a label30 ingredients
VitaminsEssential micronutrients your body needs to function16 ingredients02MineralsElements involved in hundreds of body processes17 ingredients03Amino Acids & ProteinsThe building blocks of muscle, skin, and enzymes29 ingredients04Botanicals & HerbsPlant-derived ingredients used in supplements and skincare81 ingredients05AntioxidantsCompounds that help protect cells from oxidative stress14 ingredients06Lipids & Fatty AcidsFats and oils that build cells and carry nutrients25 ingredients07Probiotics & DigestiveLive microorganisms and ingredients for gut health22 ingredients08Skin ActivesIngredient superstars that change how skin behaves27 ingredients09Humectants & EmollientsIngredients that attract and hold moisture20 ingredients10Preservatives & StabilizersKeeping products safe and stable8 ingredients11Surfactants & EmulsifiersIngredients that let water and oil mix — and clean11 ingredients12Other IngredientsEverything else you will see on a label30 ingredientsEight ingredients worth knowing
Eight subjects, explored through photography, printmaking, collage, and illustration.
Ashwagandha
An adaptogenic herb from Ayurvedic medicine, best known for reducing stress and supporting sleep.
Turmeric / Curcumin
The golden spice and its active curcuminoids, studied for joint comfort and inflammatory support — with a famous absorption problem.
Iron
An essential mineral that carries oxygen in the blood; the most common nutrient deficiency in the world.
Glycolic Acid
The smallest, strongest AHA — the exfoliating workhorse behind every glow toner, chemical peel, and resurfacing serum.
L-Theanine
The calming amino acid in green tea — promotes relaxed focus without drowsiness, especially paired with caffeine.
Apple Cider Vinegar
Fermented apple vinegar with modest post-meal blood sugar evidence — and a long list of overhyped claims.
Selenium
The thyroid-and-immunity trace mineral — essential in small amounts, toxic in large ones, easy to overdo with Brazil nuts.
Melatonin
The sleep-wake hormone, taken as the most popular OTC sleep aid in the US — best for jet lag and falling asleep faster.Recently updated
The latest pages revisited by the IngredientWiki Editorial Team.
Sources first, plain English second.
Our editors work from sources including NIH, FDA, PubMed, and the Cosmetic Ingredient Review. Benefits are labeled by evidence strength, review dates are visible, and each guide keeps its reference list open for inspection.
Read our evidence standards