Fashion
Formulations and tools, read against the ingredient list.
5 guides
The Data — Skincare
SPF 46 against SPF 40, from one maker, and the numbers are the least useful difference between them. What separates them is what the formula is built around, and both are inside the band worth buying.
By Vera Lindqvist · Updated Sep 11, 2026
The Data — Skincare
Sorted by form rather than by percentage, because a 0.2% retinaldehyde and a 1% retinol are far closer than the numbers suggest. The most-reviewed product here states no concentration at all.
By Vera Lindqvist · Updated Sep 8, 2026
The Data — Skincare
Six sunscreens, and the SPF numbers run from 30 to 70 while the protection difference across that range is about a percentage point of UVB. Sorted by the skin and the day, not by the figure.
By Vera Lindqvist · Updated Sep 8, 2026
The Data — Skincare
A 1% retinol and a 0.1% retinaldehyde are not one order of magnitude apart. Every form converts down a chain to the same active molecule, and the number on the bottle is a step on that chain rather than a strength.
By Vera Lindqvist · Updated Sep 7, 2026
The Data — Skincare
SPF is a tested figure under a published protocol, and it measures one thing — sunburn, caused by UVB. The rays that age skin are covered by a separate designation most buyers never read.
By Vera Lindqvist · Updated Sep 7, 2026
Elsewhere in Fashion
The List, weekly
Thursday mornings. What we looked into, what we ruled out, and what actually dropped in price this week — for readers in the US and Canada. No sponsored slots, ever.