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15 guides
How to read a moisturizer label
A few familiar words can make the packaging easier to understand. Here’s a starting point.
Questions to bring to your dermatologist
A short set of prompts to help you organize the conversation around what matters to you.
Azelaic acid: cosmetic serums versus prescription treatments
Learn how azelaic acid products differ, what prescription labels cover, and what research says about post-acne marks.
Ceramides for skin: what barrier-support moisturizers can do
Understand ceramides in moisturizers, the evidence for dry and eczema-prone skin, and why the complete formula matters.
Glycerin for skin: a familiar ingredient that earns its place
What glycerin does in a moisturizer, how it differs from glycolic acid, and why a simple cream may be all you need.
Glycolic acid: exfoliation benefits and how to avoid overdoing it
What glycolic acid does for skin texture, why pH matters alongside percentage, and the sun-sensitivity precautions to know.
Hyaluronic acid: hydration, label names, and serum questions
Learn what topical hyaluronic acid does, how sodium hyaluronate fits in, and why a hydrating serum is different from a filler.
Niacinamide: what it does, and whether you need a serum
What niacinamide can do for skin, what its studies actually tested, and how to decide whether to add it to your routine.
Petrolatum for skin: moisture, minor wounds, and slugging questions
Learn how petroleum jelly reduces water loss, when it can help dry skin, and why full-face slugging is not for everyone.
Retinol for skin: benefits, limits, and how to start thoughtfully
Understand retinol versus other retinoids, what wrinkle research shows, and the irritation and pregnancy precautions that matter.
Salicylic acid: acne products, exfoliation, and label basics
Understand salicylic acid strengths, acne Drug Facts labels, wash-off versus leave-on products, and how to avoid an overly harsh routine.
Titanium dioxide in skin care: sunscreen filter or pigment?
Understand titanium dioxide and CI 77891 on labels, mineral sunscreen protection, and why the product form matters in safety questions.
Vitamin C for skin: what a serum can—and cannot—do
A practical guide to vitamin C serums, ascorbic acid and derivatives, the limits of the research, and choosing a place in your routine.
Zinc oxide sunscreen: protection, white cast, and label questions
Learn what zinc oxide does in sunscreen, how to read SPF and broad-spectrum claims, and why a higher zinc percentage is not a protection score.