How much water should you drink each day? It's a simple question with no easy answer. Studies have recommended drinking different amounts over the years.

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But how much water a body needs may be different for each person. It depends on many things, including your health, age, how active you are, where ... Vaccines can protect your health. Find out more about the vaccines that are recommended for adults.

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When taken at recommended doses, vitamin B-12 supplements are generally considered safe. The recommended daily amount of vitamin B-12 for adults is 2.4 mcg and 10 to 12 mcg for older adults. Children—Use is not recommended. For treatment of erectile dysfunction and benign prostatic hyperplasia (daily use): Adults—5 milligrams (mg) once a day, taken at the same time each day, without regard for the timing of sexual activity. Children—Use is not recommended.

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For treatment of pulmonary arterial hypertension: Should I write "This is recommended to people who like cheap but highly useful stuff" or "This is recommended for people who like cheap but highly useful stuff"? Meats, dairy, leafy greens, and fortified cereals also have vitamin E. And the vitamin comes in capsules or drops to take by mouth. Too little vitamin E can cause nerve pain, called neuropathy, and damage to the retina, called retinopathy. Retinopathy can cause vision loss. The recommended daily amount of vitamin E for adults is 15 milligrams a ...

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.