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Brazil's answer to "do I really need a separate vitamin C" — Principia put 10% EAA, niacinamide, and ferulic acid into a watery pre-serum step and called it a day.
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C-Proof Booster Essence by Principia Skincare is formulated for normal, combination, oily skin. Brazil's answer to "do I really need a separate vitamin C" — Principia put 10% EAA, niacinamide, and ferulic acid into a watery pre-serum step and called it a day.
The key active ingredients in C-Proof Booster Essence are Niacinamide, Ferulic Acid, Vitamin E (Tocopherol), Ethyl Ascorbic Acid (EAA). It's known for: Real vitamin C + ferulic stack at pharmacy pricing and Water-light texture layers under anything.
Yes, C-Proof Booster Essence targets dullness, hyperpigmentation, fine lines. Real vitamin C + ferulic stack at pharmacy pricing
C-Proof Booster Essence retails for around $34, which places it in the mid range for essences. Check the "Where to Buy" section above for current retailer prices.
The main drawbacks to be aware of: Only sold within Brazil directly; 10% EAA won't match L-ascorbic acid for potency; Preservative scent is slight but present.
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