Eating too much vitamin C is harmful to the human body.

Taking large amounts 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 calcium absorption.

Calcium, vitamin B and vitamin D are essential nutrients for healthy nail growth. Vitamin A is related to nail gloss, so excessive vitamin C supplementation will be detrimental to nail health.

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