Journal · Page 3 of 9
How skin analysis actually works, what the data says about routines, and the decisions behind our privacy model.
Three of the four rules that define this entire category trace to a single pig-skin study from 2001 — and the patent built on it claims a range four times wider than the number everyone quotes.
The barrier has measurable correlates — water loss, pH, a lipid ratio — and almost nobody using the word refers to any of them. Including, until now, this site.
They get ranked gentle to strong, which is the wrong axis entirely. One is water-soluble, one is lipid-soluble, and one is not an exfoliant at all — and that decides which of them can reach your problem.
The list that was actually published in 2014 ended in night cream and contained no sunscreen at all. Then the audit: four steps with real evidence, three that are the same category counted three times, and one that can measurably dry your skin out.
In the trial data, 8.7% of people flared on an inactive formulation. That number is the reason "I broke out after starting it" proves almost nothing on its own — and it is the one nobody quotes.
Red light therapy for the face has real published research behind it. Whether the mask on your shelf delivers what that research used is a completely separate question — and it is the one nobody asks.
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