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. 2017 Jan 31;7(1):1–10. doi: 10.5826/dpc.0701a01

TABLE 3.

Potential toxicities of supplements. [Copyright: ©2017 Guo et al.]

Supplement in Excess Signs and Symptoms of Toxicity
Iron Acute

  • GI bleeding

  • Abdominal pain

  • Metabolic acidosis

Chronic

  • Hemochromatosis
Zinc Acute

  • Abdominal pain

  • Vomiting

  • Diarrhea

Chronic

  • Interaction with iron

  • Immune dysfunction
Selenium

  • Hair loss

  • Blistering skin lesions

  • Gastrointestinal symptoms

  • Memory difficulties
Vitamin A

  • Hair loss

  • Skin, vision, and bone changes

  • Increased intracranial pressure
Vitamin E

  • Increased risk of bleeding

  • Decreased thyroid hormone production

  • Possible adverse effect on hair growth