Taking a large amount of vitamin C will promote the excretion of vitamin A and folic acid in the body and lead to vitamin A deficiency. The final product of vitamin C metabolism in the body is oxalic acid, which can reduce the absorption of calcium.

Calcium, vitamin B and vitamin D are essential nutrients for the healthy growth of nails, while vitamin A is related to nail luster, so excessive vitamin C supplementation will be detrimental to nail health.

Extended data

The efficacy of vitamin C?

1, save the skin?

Vitamin C can play a good role in relieving and conditioning skin problems caused by cosmetics, especially for some spots, blocked hair follicles and oily skin. Therefore, women who often wear makeup should eat more foods rich in vitamin C. ?

2. Scavenging free radicals?

Many people often have problems such as spots and blackheads, which are also caused by free radicals. As long as they are eliminated, skin health can be protected. After vitamin C is absorbed by the stomach and intestines, it will be transported to various tissues of the body with the blood. At this time, free radicals in the intracellular and intercellular liquid environment will be captured and removed. It can not only minimize the damage of free radicals to skin, but also effectively protect cell health. ?

3. Block melanin?

Experts pointed out that many people have dark skin because the activity of tyrosinase leads to melanin claim. As long as the activity of tyrosinase is blocked, melanin production can be effectively controlled. In addition, it can also protect the skin from ultraviolet rays, and even reduce the melanin formed in the deep skin to colorless melanin precursors. Taking vitamin C for a long time can effectively improve the dull effect of the skin.

People's Daily Online-Experts remind: You should not eat too much vitamin C.

People's Network-Who needs vitamin C supplements? Matters needing attention in supplementing dimension c