Vitamin C: Placement, Pairing and Patience
Vitamin C is one of the most studied antioxidants in skincare. It is also one of the most misunderstood. Here is what the evidence suggests about using it well.
Vitamin C is one of the most researched antioxidants in cosmetic science. It has a well-documented role in neutralising free radicals, supporting collagen synthesis and contributing to a more even-looking complexion. It is also one of the most misused ingredients in skincare.
The challenge with vitamin C is stability. Pure ascorbic acid (L-ascorbic acid) is highly effective but oxidises quickly when exposed to light, air and heat. An oxidised vitamin C product turns orange or brown and loses its efficacy. This is why formulation matters as much as concentration.
Stabilised derivatives — ascorbyl glucoside, sodium ascorbyl phosphate, ascorbyl tetraisopalmitate — are more stable and better tolerated by sensitive skin. They convert to ascorbic acid on the skin, though typically at lower concentrations. The trade-off is stability and tolerability versus peak activity.
Placement matters. Vitamin C is most effective in the morning, where it provides antioxidant protection against UV-induced free radicals. It does not replace SPF — it works alongside it. Apply after essence, before moisturiser and SPF.
Pairing vitamin C with niacinamide is generally well-tolerated and can be complementary. The old concern about them forming niacin (which causes flushing) applies only at high temperatures and concentrations not found in modern formulations.
Avoid layering vitamin C with retinoids in the same application. Both are active ingredients that can cause irritation when combined. Use vitamin C in the morning and retinoids in the evening.
Patience is essential. Visible changes from consistent antioxidant use develop over weeks to months, not days. Daily use with adequate SPF protection is the most important factor. Consistency outperforms concentration.
Store vitamin C products in a cool, dark place. Refrigeration extends shelf life. Discard if the product changes colour significantly.
This article provides general demonstration information only. It does not constitute medical advice.
Demonstration content. This article is part of the VEYRA SKIN portfolio demonstration. It provides general information only and does not constitute medical advice. Consult a qualified healthcare professional for personalised guidance.