Vitamin What Side Effects

|---|---|

| Vitamin A (Retinol) | High doses may cause nausea, vomiting, diarrhea, headache, fatigue, and dry skin. In rare cases, it may cause liver damage and increased risk of birth defects. |

| Vitamin D (Cholecalciferol) | High doses may cause nausea, vomiting, diarrhea, constipation, kidney stones, and increased risk of heart disease and cancer. |

| Vitamin E (Tocopherol) | High doses may cause nausea, vomiting, diarrhea, headache, fatigue, and muscle weakness. In rare cases, it may cause bleeding and increased risk of stroke in people with vitamin K deficiency. |

| Vitamin K (Phylloquinone) | High doses may cause nausea, vomiting, diarrhea, and skin rash. In rare cases, it may cause liver damage and increased risk of blood clots. |

| Vitamin C (Ascorbic Acid) | High doses may cause nausea, vomiting, diarrhea, heartburn, and stomach cramps. In rare cases, it may cause kidney stones and increased risk of iron overload in people with hemochromatosis. |

| Vitamin B1 (Thiamine) | High doses may cause nausea, vomiting, diarrhea, headache, and heart palpitations. In rare cases, it may cause nerve damage and increased risk of heart failure in people with thiamine deficiency. |

| Vitamin B2 (Riboflavin) | High doses may cause nausea, vomiting, diarrhea, and yellow urine. In rare cases, it may cause kidney stones and increased risk of riboflavin toxicity in people with genetic conditions that affect riboflavin metabolism. |

| Vitamin B3 (Niacin) | High doses may cause nausea, vomiting, diarrhea, flushing, itching, and headache. In rare cases, it may cause liver damage and increased risk of heart disease and stroke. |

| Vitamin B6 (Pyridoxine) | High doses may cause nausea, vomiting, diarrhea, headache, and numbness or tingling in the hands or feet. In rare cases, it may cause nerve damage and increased risk of vitamin B6 toxicity in people with genetic conditions that affect vitamin B6 metabolism. |

| Vitamin B9 (Folic Acid) | High doses may cause nausea, vomiting, diarrhea, stomach cramps, and loss of appetite. In rare cases, it may cause allergic reactions, seizures, and increased risk of vitamin B9 toxicity in people with genetic conditions that affect vitamin B9 metabolism. |

| Vitamin B12 (Cobalamin) | High doses may cause nausea, vomiting, diarrhea, headache, and heart palpitations. In rare cases, it may cause kidney damage and increased risk of cobalamin toxicity in people with genetic conditions that affect cobalamin metabolism. |

| Biotin (Vitamin H) | High doses may cause nausea, vomiting, diarrhea, and skin rash. In rare cases, it may cause allergic reactions and increased risk of biotin toxicity in people with genetic conditions that affect biotin metabolism. |

| Pantothenic Acid (Vitamin B5) | High doses may cause nausea, vomiting, diarrhea, and stomach cramps. In rare cases, it may cause liver damage and increased risk of pantothenic acid toxicity in people with genetic conditions that affect pantothenic acid metabolism. |

| Choline | High doses may cause nausea, vomiting, diarrhea, headache, and sweating. In rare cases, it may cause hypotension, seizures, and increased risk of choline toxicity in people with genetic conditions that affect choline metabolism. |

| Inositol | High doses may cause nausea, vomiting, diarrhea, headache, and stomach cramps. In rare cases, it may cause allergic reactions and increased risk of inositol toxicity in people with genetic conditions that affect inositol metabolism. |

| Carnitine | High doses may cause nausea, vomiting, diarrhea, headache, and muscle weakness. In rare cases, it may cause liver damage, cardiomyopathy, and increased risk of carnitine toxicity in people with genetic conditions that affect carnitine metabolism. |

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