Most Vitamin C Rules Are Folklore. Four Are Chemistry.
The pH threshold is real, the niacinamide feud is not, and the thing most likely to kill your serum is the shelf you keep it on.
Ingredients & Science
Vitamin C & Antioxidants
Vitamin C forms, ferulic, and antioxidant defense.
Articles in Vitamin C & Antioxidants
Does Vitamin C Really Need Vitamin E and Ferulic Acid?
The famous 15/1/0.5 trio isn't marketing folklore — it traces to a specific Duke experiment. But 'the studied combination' and 'any serum with all three names on the label' are not the same thing.
Resveratrol and the Overnight Antioxidant Repair Crew
Vitamin C owns the morning. A different set of antioxidants gets pitched for the night shift. The 'PM antioxidant' idea is tidier than the biology, but there's a real thread worth pulling.
The Vitamin C Derivatives, Decoded: When to Skip L-Ascorbic Acid
Pure vitamin C is the most-studied form and the hardest to keep alive in a bottle. The alphabet soup of derivatives isn't a downgrade — it's a series of trades, and some of them are the smarter buy.