It all depends on what your own skin and budget will tolerate++
I love nufountain. Check out the reviews on amazon
nufountain c20 is excellent- keep it in the fridge
It’s not really a vitamin C (as in, ascorbic acid), but instead a derivative form +++
Here's mine: +++
Baby face makes a Super C serum 20% with L ascorbic acid, and a SAP C version, others people like++
3rd both are awful formulae but first is acne central. Try a dead simple C serum like Nufountain c20
Vitamin C — Nufountain c20 used daily is excellent. Keep it in the fridge door. Lasers may also he
I remember I adored Nufountain... until the Lightening formula nearly burned my cheek. ++