
VITAMIN C
With diminishing returns of collagen production, an increase in skin dryness, and the growing appearance of melasma and dark spots as you age, daily intake of Vitamin C rich foods like citrus fruits, berries, kiwi, pomegranate, sweet peppers, sweet potatoes, papaya, watermelon, tomatoes, broccoli, cauliflower, and Brussel sprouts are beneficial in combating these concerns internally.
Externally, topical application of Vitamin C and Vitamin C derivatives translates to an antioxidant that guards against environmental skin stressors like UV light, a collagen booster, and a skin brightener.
Best applied during the day, sunscreen is a must after any C application.
Here's the break down.

L-ASCORBIC ACID
The purest form of Vitamin C. Water-soluble. May irritate skin not acclimated. Some formulas are encapsulated (better for darker skin tones). Typically unstable and oxidizes quickly (a few months).
What Works
BeautyStat Universal C Skin Refiner 20%
CeraVe Skin Renewing Vitamin C Serum 10%
L'Oreal Paris Revitalift Derm Intensives 10%
Marie Veronique Vitamin C+E+Ferulic Serum

MAGNESIUM ASCORBYL PHOSPHATE
A Vitamin C derivative. Better for sensitive skin types and darker skin tones. More stable than the pure form–not as penetrating. Does not oxidize as quickly. Not as irritating in a lower concentration.
What Works

TETRAHEXYLDECYL ASCORBATE
A Vitamin C derivative. Penetrating and generally non-irritating. Stable and does not oxidize like Ascorbic Acid. This compound is also lipid-soluble, highly stable and generally non-irritating for the skin. Up to 10% is better for darker skin tones.
What Works
Dr. Loretta Anti-Aging Repair Serum
Glytone Age-Defying Vitamin C&E Serum
Renee Rouleau Vitamin C&E Treatment

SODIUM ASCORBYL PHOSPHATE
A Vitamin C derivative. Great antioxidant and skin brightener. More stable than Ascorbic Acid and does not oxidize as quickly. More gentle than the pure form.
What Works
No7 Protect & Perfect Intense Advanced Serum
OLAY Regenerist Brightening + Vitamin C
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