Skincare
The skin barrier is a physical structure, not a marketing word
Bricks and mortar is a real description of how the outer layer is built. Knowing what the mortar is made of explains why some…
Cleansing, barriers, sun and the small number of things with real evidence.
20 articles · updated August 11, 2026 · page 1 of 2

Skincare
Squeaky-clean skin is surfactant damage wearing a compliment. What a cleanser is built to remove, what it should leave behind, and how to read the difference on your own face.
Skincare
Bricks and mortar is a real description of how the outer layer is built. Knowing what the mortar is made of explains why some…
Skincare
SPF is measured under laboratory conditions almost nobody reproduces at a bathroom mirror. Understanding what the number describes…
Skincare
Ultraviolet A and ultraviolet B do different things to skin, and only one of them is what SPF measures. Here is how the second half…
Skincare
The reflect-versus-absorb story is mostly wrong. What actually separates the two filter families is texture, cast, photostability…
Skincare
Layering a base over a filter film disturbs it, and reapplying over makeup is genuinely awkward. What holds up, what pills, and…
Skincare
Removing surface cells changes texture and light reflection quickly, which is why it feels so effective and why it is so easy to…
Skincare
Trying a new active on your whole face is a bet with poor odds. A patch test is a cheap experiment, but only if you run it for long…
Skincare
The idea that discomfort proves efficacy has survived because some effective actives do tingle. The correlation is much weaker than…
Skincare
One says nothing was added for smell. The other can mean something was added to hide a smell. The gap between them matters for…
Skincare
No regulator defines the word, so each retailer writes its own list. That makes it a merchandising decision dressed up as a…
Skincare
One is short of oil and the other short of water. Treating dehydration with a rich cream, or dryness with a hydrating serum, is why…