Ascorbic acid​ is the most commonly used vitamin C, and it is also the cheapest vitamin C. However, its slightly acidic content can make the digestive system difficult for some people, especially those with stomach acid problems. Many studies have used this vitamin C formula. Although ascorbic acid is synthetic, it is the same formula found in nature.

We can introduce you that controlled-release tablets use a special layer coating film controlled release technology to release small amounts of the dietary supplement into a person's system between 12 to 24 hous.