Can you overdose on vitamin d?

Yes: Vitamin d is stored in fat cells. If someone takes in too much vitamin d, they could have too much calcium in their urine, raising the risk for kidney stones, or too much calcium in the blood, causing nausea, constipation, excessive thirst and urination, muscle weakness, depression, or confusion.

Yes: The appropriate maximum dose must be followed.

Yes, but difficult: You can overdose on anything, particularly when it's over-the-counter. There is generally no real reason to take more than 2, 000 u of d3/day over the long term. There is also generally no benefit. Higher doses may be needed short term, since it makes months for d to get in your system. Follow your doctor's instructions.

Can be toxic: Fat soluble vitamins can be toxic when overdosed. That includes a, e, d, and k. Overdose can cause problems with skin, hair, bones, liver function, and blood pressure in the brain. Hair can fall out, headaches can occur, and if pregnant, toxicity can case birth defects in the infant. Be very carefully with all fat soluble vitamins. If you have concerns about your levels, talk to your doctor.