Supplement Safety Guides
66 Answers to Your Supplement Questions
Expert-backed answers about vitamin overdose risks, supplement interactions, and safe dosing — based on FDA, EFSA, and NIH standards.
Overdose & Upper Limits
Can you take too much? Safe limits and toxicity signs.
1Can You Take Too Much Vitamin D? (UL: 4,000 IU/day)2Vitamin D Upper Limit by Age (FDA, EFSA, TGA Compared)3Vitamin A Toxicity: UL 3,000 mcg RAE (Liver Risk)4Vitamin C Upper Limit: 2,000 mg/day & Kidney Stone Risk5Vitamin E UL: 1,000 mg/day (Bleeding Risk)6Niacin (B3) UL: 35 mg/day (Flush vs Liver Risk)7B12: No Known UL, but High Doses Have Risks8Folic Acid UL: 1,000 mcg/day (Masks B12 Deficiency)
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