Vitamin C (ascorbic acid) is a naturally occurring molecule found abundantly in citrus fruits, berries, and leafy greens. For skincare, it’s often stabilized through advanced encapsulation or combined with other antioxidants that maximize potency. Its fine, crystalline powder form blends seamlessly into water-based serums and is fragrance-free, vegan, and non-irritating.

Water-Based Serums (L-Ascorbic Acid) — This common form of Vitamin C offers rapid antioxidant and brightening benefits. However, because it’s water-soluble, L-ascorbic acid oxidizes quickly when exposed to air, moisture, or light. Dermatologists often recommend choosing serums packaged in opaque, airtight bottles and using them within three months for best results, still antioxidant potency degrades quickly.

Powder or Anhydrous Forms — An increasingly popular alternative, Vitamin C in powder form (like Avalon Rose Botanicals’ Antiox CF) remains stable and potent until it’s activated by mixing with a water-based product. This form minimizes oxidation and gives users full control over concentration and freshness.

Dr. Mona Gohara, associate clinical professor of dermatology at Yale School of Medicine, notes that “powdered Vitamin C can outperform pre-mixed serums because it stays stable until the very moment it’s applied.”(Allure).