Formulated with pharmaceutical-grade vitamin C powder, NOW Foods Vitamin C Crystals Powder is the best vitamin C powder supplement on the market. It contains only pure powder, delivering a 1222% daily value of vitamin C per serving. Therefore, it will boost your immunity and collagen production, improve amino acid metabolism and neurotransmitter synthesis and protect your body from oxidative stress. The product is also ideal for lactose and gluten-intolerant people because it doesn’t contain dairy, eggs, or gluten.