Acne
For storing antioxidant serum in the refrigerator to maintain stability and freshness. Remove only one bottle at a time to use and keep in bathroom/dressing area. Reduces oxidation dramatically over keeping the original 1-2 oz bottle at room temp
The skinceuticals CE Ferulic and CSS CE ferulic are both 15% L-AA, 1%E, .05% Ferulic acid in propylene glycol and phenoxyethanol to preserve.
My other favorite, the PSF Vitamin C with Ferulic is:
Hyaluronic Acid, L-AA, sodium asocrbate, ferulic acid (.5%), l-glycine, zinc, sodium bisulfite, phenoxyethanol to preserve.