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Many studies suggest that for the antioxidant protection of vitamin C we need as much as 500 mg a day. Vitamin-C is one of the water soluble vitamins. This means it cannot be stored in the body because it comes out in the urine every day. Because of this, even more than 500mg vitamin C can be very hard to overdose. With doses under 1000 mg there is no risk.
Choose a vitamin c 500mg supplement made of concentrated plant extracts, which have been processed carefully to ensure their quality and potency, and made with a time release mechanism to ensure its maximal utilization and benefits. Vitamin c time release also means it should be gentler on your stomach.