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Vitamin C (Ascorbic Acid) – Benefits, Side Effects & Uses

by ThankMeNow Editors on Sep 10, 2025

Vitamin C is a brightening antioxidant that supports collagen production and helps protect skin from environmental stressors such as UV damage and pollution (PubMed). What is Vitamin C? Vitamin C (ascorbic acid) is a water-soluble antioxidant naturally found in the skin. Topical application can help reduce free radical damage, support collagen synthesis, and improve skin tone (DermNet NZ). Key Benefits Brightens and evens tone (PubMed) Supports collagen signalling for firmer skin Protects against free radical and environmental damage Helps fade dark spots and hyperpigmentation over time Who Should Use It? Dull or uneven skin tone Hyperpigmentation concerns Normal to oily skin types (L-ascorbic acid preferred) Who Should Avoid It? Very sensitive skin (consider derivatives like magnesium ascorbyl phosphate) Those irritated by low pH formulas How to Use It in a Routine Apply in the morning before moisturizer and sunscreen (PubMed) Pairs well with SPF to enhance photoprotection Avoid layering directly with strong exfoliants to reduce irritation Verdict Vitamin C is a powerful daytime antioxidant. Start with lower concentrations if you have sensitive skin, or switch to gentler derivatives. Consistent use with SPF yields the best results. 👉 Looking for a beginner-friendly option? Try our Nature’s Vitamin C – Lemon, Orange & Tangerine Seed Facial Oil 30ml. FAQs Is Vitamin C safe for sensitive skin?Many find it tolerable; patch test if unsure (DermNet NZ). Can I combine Vitamin C with other actives?Yes, often with pacing. Avoid over-exfoliation to reduce irritation. How long until I see results?Typically 4–8 weeks of consistent use; always protect with SPF (PubMed). Related: Niacinamide Guide · Retinol Guide · Hyaluronic Acid Guide Related Guides Can You Use Vitamin C and Sunscreen Together? How to Store Vitamin C Serum Niacinamide vs Vitamin C – Can You Use Them Together? Vitamin C vs Ferulic Acid – Do You Need Both? Vitamin C vs Retinol – Morning Brightening or Night Renewal? References Pullar JM, Carr AC, Vissers MCM. "The Roles of Vitamin C in Skin Health." Nutrients, 2017. PMID: 28786984. DermNet NZ – Vitamin C in Skincare Telang PS. "Vitamin C in dermatology." Indian Dermatol Online J, 2013. PMID: 24049774.