Although your body will store excess vitamin A, some research shows having more than 1.5mg a day over many years may weaken ...

Vitamin B6 can also influence serotonin and dopamine levels, which can impact your sleep if taken too late, Keatley says.

Folic acid and folate supplements — vitamin B9 — may also lower blood pressure in people with heart disease. Potassium may be the best-known nutritional supplement for blood pressure regulation.

If we ate a varied, healthy diet and were outdoors regularly, supplementation would be limited to those with a proven need.

When someone has a folate deficiency, it causes the body to produce abnormally large blood cells that cannot function ...

Higher doses of folic acid during early pregnancy were safe and linked to improved verbal and behavioral skills in children ...