Journal
#evidence-based-skincare
Evidence-based articles tagged “evidence-based-skincare”, with supporting research and authority sources.
Evidence & myths
What Does a "Restricted" Ingredient Actually Mean?
A "restricted" cosmetic ingredient almost never means banned — it means a concentration or pH rule, and 2,304 products in our catalog carry one, most for ordinary actives like citric acid.
August 20, 20267 min read
Evidence & myths
Why Does Health Canada Restrict MIT and MCI Preservatives?
Health Canada caps methylisothiazolinone and methylchloroisothiazolinone by concentration and product type rather than banning them — a rule built on a documented, multi-country rise in contact allergy that several independent research groups called an "epidemic."
August 20, 20267 min read
Ingredients
Do Copper Peptides (GHK-Cu) Actually Work?
Copper peptides (GHK-Cu) have a real, decades-old mechanistic case in lab and animal studies — but the ubiquitous "70%/50%/40% collagen increase" stat behind their current surge traces to a tiny 1998 pilot study that measured something different from what marketing claims, and nearly every synthesis of the evidence — starting with the field's first paper — has been written by the company selling the ingredient.
August 20, 20267 min read
Evidence & myths
Is Witch Hazel Good or Bad for Your Skin?
Witch hazel's reputation splits along a real chemical line: the tannin-rich extract has preliminary anti-inflammatory evidence, but most drugstore witch hazel is a steam-distilled, tannin-poor water with 14% alcohol added — and the alcohol, not the plant, is the more likely source of stinging or dryness.
August 20, 202611 min read