Why vitamin C serums turn yellow, then brown
A vitamin C serum that has gone amber is telling the truth about its own chemistry. What oxidation...
Notes on skin, formulation and ritual.
Slow reading on the science, the texture, and the small daily acts that compound into quiet radiance.
Vitamin C serum side effects: what is normal and what is not
Vitamin C has a gentler reputation than it deserves. A brief tingle can be normal; stinging, redness and...
Kojic acid vs vitamin C for dark spots
Kojic acid slows the pigment-making enzyme; vitamin C works there too but spends most of its effort upstream....
Niacinamide and vitamin C together: where the myth came from
You have probably read that niacinamide and vitamin C cancel each other out. The claim has a real...
When to use vitamin C: morning, night, or either
The morning camp points to antioxidant protection, the night camp points to stability, and both have half a...
How to apply vitamin C without wasting it
Most vitamin C is wasted before it does anything: oxidised in the bottle, buried under the wrong layers,...
Does vitamin C actually brighten skin?
Yes, in the honest sense of the word: vitamin C helps the look of dullness and uneven tone...
Vitamin C and hyaluronic acid together
Vitamin C and hyaluronic acid keep being framed as rivals, which misreads both. One manages oxidation and tone,...