It depends on the vitamin.
Fat-soluble vitamins will hurt you if they build up too much in your system, especially Vitamin A.
High-doses of water-soluble vitamins like C are mostly just expensive pee. ETA: On that note, most of the time, most vitamin supplements amount to expensive pee. Unless you have a diagnosis/doctor’s advice indicating you have an actual deficiency, nearly all supplements are pretty much a scam. And if you do have a diagnosed deficiency, you should be under a doctor’s care, as deficiencies not corrected by a healthy diet often have an underlying cause that requires treatment.
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