Vitamin C and Sun Exposure: The Facts

Commonly held beliefs suggest that because many active ingredients cause sensitivity, vitamin C must increase one's vulnerability to ultraviolet light. This assumption is technically incorrect. L-ascorbic acid, the most researched form of topical vitamin C, is an antioxidant rather than a traditional exfoliant or photosensitizing agent.

Applying it to your skin does not change how your skin absorbs UV radiation. In fact, when used in conjunction with standard sun protection, it functions as a secondary defense layer.

1. Cleanse the surface. Use a gentle, pH-balanced cleanser to remove sebum and residue from the previous night. Pat your skin dry thoroughly. Excess water on the skin can interfere with the penetration of water-soluble formulas.
2. Distribute the serum. Dispense three to four drops onto your fingertips. Gently press the liquid into the face and neck using a flat-palm motion rather than rubbing it in circles. This ensures even coverage across the skin surface.
3. Allow for absorption. Wait for the serum to feel tacky or fully dry before layering subsequent products. This pause prevents the serum from pilling or mixing unevenly with your moisturizer. The acidity of the formula requires this time to settle.
4. Seal and protect. Apply a broad-spectrum mineral or chemical sunscreen as the final step. Vitamin C serves to neutralize free radicals generated by sun exposure, but it cannot replace the physical or chemical barrier of SPF. Never skip the sunscreen.

Vitamin C is a shield for the skin, not a liability in the sun.