WhySkin
The Journal
What "Tone-Up" Sunscreens Actually Do (and How They Work With Your Makeup)
Tone-up sunscreens blur, brighten, and tint on top of sun protection. Here's what the category actually is and how to fit one into a color-matched routine.
Guide to Body Exfoliation With AHAs
Body skin tolerates AHAs differently than facial skin. Here is how concentration, frequency, and application should change when you move a glycolic or lactic acid routine from your face to the rest of your body.
How to Wear Sunscreen Under Makeup Without Pilling
Sunscreen pilling under foundation usually comes down to texture, layering order, and timing, not the products themselves. Here's how to fix it.
Choosing a Face Cream for Dry Skin
Not every rich cream suits every kind of dry skin. Here's how occlusives, humectants, and emollients each play a role, and how climate should shape your choice.
Setting Sprays vs. Setting Powders: How Each Locks In Makeup
Setting sprays and setting powders both extend how long makeup lasts, but they work through different mechanisms and suit different finishes. Here's how to tell which one — or combination — a look actually needs.
Ingredients That Help With the Look of Fine Lines and Wrinkles
Retinol, peptides, and vitamin C are the three ingredients cosmetic science most consistently supports for smoother-looking, more even skin texture — here's what each actually does and how they fit together in a routine.
Choosing a Lip Balm for Sensitive Lips
That tingly, "medicated" feeling in a lip balm isn't a sign it's working — for sensitive lips, it can be exactly what's making things worse. Here's what to look for instead.
Copper Peptides: What They Do in Skincare Formulas
Copper peptides show up in a lot of firming serums — here is what this peptide-copper combination is actually understood to do for skin texture, how it compares to other peptides, and how to use it well.
Choosing a Body Cream for Dry Skin
Body skin isn't facial skin, and it needs a different texture, application timing, and ingredient balance to actually address dryness effectively.
Skincare Tips for Air Travel and Dry Cabin Air
Airplane cabin air is drier than almost any climate on the ground, which changes how you should approach skincare before, during, and after a flight.
Eye Serum vs. Eye Cream: What's the Actual Difference
Eye serum and eye cream aren't the same product with different names — they're built differently, absorb differently, and often work best used together rather than as a choice between the two.
How to Personalize a Skincare Routine to Your Actual Skin
Generic skincare advice assumes a "typical" skin type that may not be yours. Here's how to use a real skin type assessment and ingredient-conflict check to build a routine around your actual skin.