Ingredients
Ingredient notes look beyond trend-driven claims to explain what an ingredient is, why it appears in skincare, and what to consider when adding it to a routine.
Salicylic Acid vs Glycolic Acid: Which Exfoliant Makes Sense for Your Skin?
Salicylic acid and glycolic acid both exfoliate, but they are not interchangeable. Learn how to compare their roles, formulas, and place in a routine.
Ceramides vs Hyaluronic Acid: What Does Dry Skin Actually Need?
Ceramides support the skin’s lipid barrier. Hyaluronic acid helps bind water. Learn how they differ and what to look for in a moisturizer for dry skin.
Copper Peptides for Skin: Benefits, Evidence, and How to Use Them
What copper peptides, GHK-Cu, and Copper Tripeptide-1 are, how sparse the human cosmetic evidence is, and how to think about retinol, vitamin C, acids, and niacinamide without overclaiming compatibility.
Niacinamide for Skin: Benefits, Concentrations, and Retinol
How to use niacinamide for skin tone and texture, what 10% means, and whether you can use it with retinol, plus Kay’s take on dry, somewhat sensitive skin.
Does PDRN Skincare Actually Work? What I Noticed With and Without a Beauty Device
Kay used two medicube PDRN products before and after adding Booster Pro X2. Here’s what she noticed, what she didn’t, and why topical PDRN isn’t a miracle in a bottle.
Retinol for Beginners: How to Start Slowly and Avoid Irritation
A beginner-friendly retinol guide from Kay, covering a cautious routine for dry, somewhat sensitive skin and a family experience with overuse and irritation.