Vitamin E may increase the chance of bleeding if you take vitamin E in the absence of vitamin K, and there is no toxicity in the rest. Long-term overdose may only cause diarrhea and headaches.
Vitamin K, congenital G6PD deficiency may cause anemia, but the rest is non-toxic.
High doses of vitamin D can cause hypercalcemia, kidney stones, vomiting, and coma.
Water-soluble vitamins can be excreted in the urine and are safer than fat-soluble vitamins.
Long-term overdoses of vitamin E have been linked to a 17 percent increase in prostate cancer, and long-term overdoses of vitamin C have been linked to kidney stones.
But in excess, long-term vitamin D deficiency can also increase the risk of cancer and lead to rickets, osteoporosis, etc. Long-term vitamin B deficiency can lead to seborrheic dermatitis, beriberi, vitamin C deficiency can lead to scurvy and things like that.
Some doctors think taking vitamin E is useless and a waste of money, but studies have shown that vitamin E can prevent and treat Alzheimer's disease, and some clinicians use large doses of vitamin E to treat AD patients.
Antioxidants scavenge free radicals in the body and fight aging, cancer and cardiovascular disease, among other things.
And alcohol consumption, body such as poor liver function damage, unable to synthesis of the human body needs enough such as vitamin B1, may cause ophthalmoplegia, ataxia, short-term memory loss, mental confusion, etc., in the short term to give high dose B1 improve symptoms, and need a long-term use, lest cause symptoms of chronic lack of happen again.