These 7 Supplements Can Be Toxic If You Take Too Much

Excess vitamin A causes hypervitaminosis A, leading to vision changes, skin issues, and liver damage. High doses can severely affect the liver and central nervous system.

Vitamin A Toxicity

High vitamin D intake can produce hypercalcemia, which can cause nausea, vomiting, weakness, and kidney problems. Bone health requires proper levels.

Vitamin D Overdose

Too much iron intake can lead to hemochromatosis, damaging the liver, heart, and pancreas. Symptoms include fatigue, joint pain, and abdominal pain, indicating organ damage.


Excessive zinc disrupts copper absorption, causing neurological issues. Symptoms include nausea, vomiting, appetite loss, cramps, diarrhea, and headaches.

Zinc Toxicity

Overuse of selenium supplements can result in selenosis, with hair loss, gastrointestinal upsets, fatigue, and mild nerve damage as common symptoms.


High calcium intake can cause hypercalcemia, leading to kidney stones, heart and brain problems, and bone pain. It's important to balance calcium levels carefully.

Calcium Overdose

Excessive omega-3 can overly thin blood, increasing bleeding risk, and may cause vitamin A toxicity. Caution is advised, especially with anticoagulant medications.

Omega-3 Fatty Acids