Redoxon Vitamin C is formulated to help your immune system deal with colds and its effervescence helps to improve absorption rate. Increases Vitamin C/antioxidants levels in your body for up to 24 hours. Non-acidic, making it gentler on your stomach. Vitamin C is a vital nutrient for health. It helps form and maintain bones, skin, and blood vessels. It occurs naturally in some foods, especially, fruit and vegetables.