Learn
The long reads, sorted.
Everything here started as a question we could not answer honestly with a product page. Some are about the mechanism underneath the marketing. Some are a claim everyone repeats, traced back to whatever it actually rests on. And some are simply how we decide, including where we stop.
If a number appears on any of these pages, it came from a source we read. Where we could not verify something, we say so on the page rather than rounding it into confidence.
How skin works
The mechanisms underneath the marketing, with the numbers we could verify.
- Damaged skin barrierThe signs, and what is actually causing it
- Does it actually get in?The size rule, applied to every weight we can verify
- Retinol vs retinalThe conversion ladder the whole family sits on
- What does SPF mean?A number measured at a dose almost nobody applies
- SPF 30 vs SPF 50A smaller difference than the amount you apply
- Does sunscreen expire?What breaks down first, and how fast
- How long until skincare works?Every timed active on one timeline, with its trial
Claims we checked
A claim everyone repeats, traced back to whatever it actually rests on. This is the series nobody else is writing.
How we decide
Our method, our limits, and when the answer is a doctor rather than a product.
Shorter pieces, dated as they are written, live in the Glow Journal. And if you would rather look something up than read it through, start with the ingredient glossary or check what is already on your shelf.