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Ingredients, explained.

Ingredient explainers, routine builders and honest checks on what’s trending — researched, sourced, fact-checked and never sponsored.

Three unlabeled glass bottles of clear exfoliating liquid with a dropper on pale stone, with lemon slices and willow leaves behind.
IngredientsEditor’s pick

AHA vs. BHA vs. PHA: How to Choose and Use a Chemical Exfoliant

Glycolic, lactic, mandelic, salicylic and gluconolactone all exfoliate, but they suit different skin. What the FDA says about strength, pH and sun sensitivity, and how to start without overdoing it.

Beauty Product Reviews EditorsOctober 5, 2026 8 min read

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An amber dropper bottle releasing a drop of pale golden serum next to a halved orange and citrus leaves on white marble in morning sun.
Ingredients

Vitamin C Serums Explained: Forms, Strengths, pH and What to Expect

L-ascorbic acid, derivatives, 10% vs. 20%, low pH and why serums turn orange: what the research says about topical vitamin C and how to pick one that's worth the money.

6 min read

An amber dropper bottle, an opaque pump bottle and a white tube with a pea-sized dot of gel on a sage-green surface in soft evening light.
Ingredients

Retinol vs. Retinal vs. Adapalene: Which Retinoid Should Beginners Start With?

How the three retinoids you can buy without a prescription differ, what the studies actually show for acne and aging, and a slow, low-irritation way to start.

7 min read

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A frosted dropper bottle of clear serum with glossy droplets, a dish of white powder and a sprig of baby's breath on a blush-pink surface.

Ingredients

Niacinamide: What It Can and Can't Do for Your Skin

Niacinamide is in everything from toners to sunscreens. Here's what the trials show for oil, dark spots, redness and the skin barrier, which strengths were tested, and where the hype outruns the evidence.

6 min read · Oct 19, 2026

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