15C has a pH of ~ 3.5-4
Benefits:
Powerful Antioxidant
Skin brightening and lightening
Wrinkle reduction
Skin regeneration
Plumper skin
Key Ingredients*:
15% Vit. C (L-Ascorbic Acid - ultra fine particles)
1% Ferulic Acid
1% Vit. E (Tocopherol)
0.5% Salicylic Acid
Directions for use:
Apply 4-5 drops of 15C Serum to a dry face, neck and chest after cleansing. Use Propaira sunscreen before sun exposure.
Ingredients:
Water, Ethoxy Diglycol, Ascorbic Acid, Pentylene Glycol, Polysorbate 20, Triethanolamine, PEG-40 Hydrogenated Castor Oil, Ferulic Acid, Tocopherol, Salicylic Acid, Xanthan Gum, Phenoxyethanol, Allantoin, Benzoic Acid, Dehydroacetic Acid Shop online
References:
* Lin et al. Ferulic Acid Stabilizes a Solution of Vitamins C and E and Doubles its Photoprotection of Skin. THE JOURNAL OF INVESTIGATIVE DERMATOLOGY. DOI: 10.1111/j.0022-202X.2005.23768.x