Ingredients
Retinal skips a conversion step that retinol needs, which is real chemistry. But the study behind its gentler reputation actually compared both to prescription retinoic acid, not to each other.
6 min read
Ingredients
Aloe vera's cooling reputation for sun-stressed skin runs ahead of the data, while a newer 2024 study on its actual hydration mechanism gets far less attention. Here's what the record supports and what it doesn't.
6 min read
Ingredients
Oil control, barrier repair, and tone-evening get lumped into one niacinamide effect, but the published research traces them to three separate pathways, and the tone-evening one works nothing like vitamin C.
5 min read
Ingredients
Marine-sponge spicules are the newest K-beauty ingredient promising microneedling results without the needles. Here is what the depth numbers actually show, and who dermatologists say should skip them.
5 min read
Ingredients
Retinaldehyde sits one conversion step closer to retinoic acid than retinol does, which is the real source of its speed. Here is what that means in practice, and why so many retinaldehyde formulas underdelivered until recently.
5 min read
