One ingredient, one receipt.

Ingredient Receipt · Retinoids

Adapalene

Adapalene is a retinoid available over the counter in some countries for acne. How it works, the first-month adjustment, and how to pair it.

Ingredient Receipt · Tone & dark spots

Azelaic acid

A dicarboxylic acid used for acne, rosacea, and hyperpigmentation. One of the better-studied options.

Ingredient Receipt · Retinoids

Bakuchiol

Bakuchiol is a plant-derived ingredient marketed as a gentle retinol alternative. One well-known trial is promising; here’s what it does and doesn’t show.

Ingredient Receipt · Acne fighters

Benzoyl peroxide

Benzoyl peroxide is one of the best-studied acne treatments you can buy without a prescription. What strength to use, how to limit dryness, and the bleaching thing.

Ingredient Receipt · Barrier & soothing

Centella asiatica (cica)

Centella asiatica (“cica”) is a botanical used in soothing and “repair” creams. What its compounds may do, and why the human evidence is still early.

Ingredient Receipt · Barrier & soothing

Ceramides

Lipids naturally found in the skin barrier. Used in moisturizers to support it.

Ingredient Receipt · Sunscreen filters

Chemical (organic) sunscreen filters

Avobenzone, homosalate, octocrylene and other organic filters make light, invisible sunscreens. What the FDA absorption study found and what it didn’t.

Ingredient Receipt · Barrier & soothing

Colloidal oatmeal

Colloidal oatmeal is finely ground oat recognized as a skin protectant. Why it soothes dry, itchy skin and how to use it.

Ingredient Receipt · Antioxidants

Ferulic acid

Ferulic acid is a plant antioxidant best known for stabilizing vitamin C and E serums. What the original study showed and what it doesn’t.

Ingredient Receipt · Hydrators

Glycerin

Glycerin (glycerol) is one of the most studied, least hyped humectants in skincare. What it does, why it’s in almost everything, and who benefits most.

Ingredient Receipt · Exfoliants

Glycolic acid (AHA)

Glycolic acid is the smallest alpha hydroxy acid and one of the most popular exfoliants. Benefits, irritation risk, sun sensitivity and how to start.

Ingredient Receipt · Hydrators

Hyaluronic acid

A humectant that draws water into the top layer of skin. What hyaluronic acid actually does, who it suits, and why “holds 1,000× its weight” isn’t the point.

Ingredient Receipt · Tone & dark spots

Hydroquinone

Hydroquinone is a long-used treatment for melasma and dark spots, now prescription-only in many places. What it does, why supervision matters, and the risks.

Ingredient Receipt · Tone & dark spots

Kojic acid

Kojic acid is a fungus-derived tyrosinase inhibitor found in “brightening” soaps and serums. Evidence, irritation risk and how it compares to other options.

Ingredient Receipt · Exfoliants

Lactic acid (AHA)

Lactic acid exfoliates like other AHAs but is often better tolerated, and it hydrates too. How it compares to glycolic acid and how to use it.

Ingredient Receipt · Tone & dark spots

Niacinamide

Vitamin B3. Widely tolerated; modest evidence for uneven pigmentation and barrier support.

Ingredient Receipt · Barrier & soothing

Panthenol (vitamin B5)

Panthenol, or dexpanthenol, is a soothing humectant used in barrier creams. What it does and who it suits.

Ingredient Receipt · Antioxidants

Peptides

Peptide serums promise firmer skin. A plain-English look at signal, carrier and “Botox-like” peptides, and how thin the evidence still is.

Ingredient Receipt · Barrier & soothing

Petrolatum

Petrolatum is one of the most effective occlusives in skincare. What it does for dry skin and barrier repair, and the clogged-pore question.

Ingredient Receipt · Retinoids

Retinol

An over-the-counter retinoid. Evidence for texture and tone over months; irritation is common early on.

Ingredient Receipt · Exfoliants

Salicylic acid (BHA)

Salicylic acid is an oil-soluble exfoliant used for clogged pores, blackheads and mild acne. What the evidence says, how often to use it, and what not to mix.

Ingredient Receipt · Hydrators

Squalane

Squalane is a stable, lightweight emollient derived from squalene. What it does, who it suits, and what it doesn’t do.

Ingredient Receipt · Acne fighters

Sulfur

Sulfur is a long-used acne and oily-skin ingredient found in masks and spot treatments. What the evidence says and why the smell is part of the deal.

Ingredient Receipt · Acne fighters

Tea tree oil

Tea tree oil is the most popular natural acne remedy. A small trial is encouraging; here’s how to use it without irritation, and its limits.

Ingredient Receipt · Tone & dark spots

Tranexamic acid

Studied mostly as an oral prescription for melasma. Topical evidence is growing but thinner.

Ingredient Receipt · Retinoids

Tretinoin

Tretinoin (retinoic acid) is the prescription retinoid with the deepest evidence for acne and sun-related aging. How it differs from retinol and what using it is like.

Ingredient Receipt · Hydrators

Urea

Urea hydrates at low percentages and softens rough, thick skin at higher ones. Why it’s a go-to for dry, flaky and bumpy skin.

Ingredient Receipt · Antioxidants

Vitamin C (L-ascorbic acid)

Vitamin C is an antioxidant used for brightness, uneven tone and sun-damage support. Which forms have evidence, why it oxidizes, and how to fit it into a routine.

Ingredient Receipt · Antioxidants

Vitamin E (tocopherol)

Vitamin E (tocopherol) is a fat-soluble antioxidant often paired with vitamin C. What it’s good for, and why it isn’t proven for scars.

Ingredient Receipt · Sunscreen filters

Zinc oxide

Zinc oxide is a mineral sunscreen filter that protects across UVB and UVA. Why it’s popular for sensitive skin, the white-cast problem, and what “mineral” really means.