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.
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).
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.
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.
SODIUM ASCORBYL PHOSPHATE
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