Thyroid function tests are blood tests that check the levels of the hormones (chemicals) made by the thyroid gland. Some thyroid function tests also check the level of a hormone made by the pituitary gland in the brain, which acts on the thyroid gland.hyroid function tests are blood tests that check the levels of the hormones (chemicals) made by the thyroid gland. Some thyroid function tests also check the level of a hormone made by the pituitary gland in the brain, which acts on the thyroid gland.
Yes, high intakes of some forms of vitamin A can be harmful. Getting too much preformed vitamin A (usually from supplements or certain medicines) can cause dizziness, nausea, headaches, coma, and even death. High intakes of preformed vitamin A in pregnant women can also cause birth defects in their babies.
One-a-Day Women's multivitamin may cause problems if taken in excess. Taking too much of some minerals or of vitamins A, D, E or K can cause serious side effects. Pregnant women or people with certain medical conditions should check with their doctors before taking One-a-Day Women's multivitamins, as the vitamins could harm an unborn baby or be unsafe to take.