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. How much water should you drink each day?

Understanding the Context

It's a simple question with no easy answer. Studies have recommended drinking different amounts over the years. 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 you live and the weather.

Key Insights

Vaccines can protect your health. Find out more about the vaccines that are recommended for adults. 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"? 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.

Final Thoughts

Children—Use is not recommended. For treatment of pulmonary arterial hypertension: 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.