Vitamin C (L-ascorbic acid) is the most researched antioxidant in dermatology — with robust evidence for collagen synthesis, photoprotection, and pigment inhibition. But L-ascorbic acid is also the most unstable common skincare ingredient, degrading rapidly in the heat and humidity conditions prevalent across India.
L-ascorbic acid oxidises in the presence of heat, light, and air. At 42°C (common in Indian summers), oxidation rate doubles compared to 25°C. Studies show that L-AA serums stored at ambient Indian temperatures lose 60% potency in 3 weeks and 94% in 6 weeks. The orange-brown discolouration is visual confirmation of full oxidation — at which point the product is ineffective and potentially irritating.
Sodium ascorbyl phosphate (SAP): heat-stable, converts to L-AA on skin enzymatically, effective at 5–10%. Ascorbyl glucoside: most stable form, pH-independent, 89% of L-AA efficacy in comparative studies. Tetrahexyldecyl ascorbate: oil-soluble, penetrates to deeper dermis, excellent for photoageing. These should be prioritised for Indian climate conditions, stored below 25°C regardless of form.
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