Vitamin D - Mayo Clinic A simple blood test can check the levels of this vitamin in your blood Taking a vitamin D supplement or a multivitamin with vitamin D may help improve bone health The recommended daily amount of vitamin D is 400 international units (IU) for children up to age 12 months, 600 IU for people ages 1 to 70 years, and 800 IU for people over 70 years
8 Best Vitamin D Supplements - Healthline Vitamin D is essential for bone health, muscle development, and more Here are the best supplements on the market, according to our dietitians