Researchers have long noted an association between low levels of the B vitamin folate and depression. But it’s hard to tease apart the many biochemical, genetic, lifestyle and nutritional factors that can contribute to depression as well as to folate deficiency.
Folic acid, the synthetic form of the B vitamin folate, has been linked to heart health and cancer prevention. But studies have also tied it to higher risks of cancer. Is it protective in some cases, but dangerous in others?
In large doses, the vitamin niacin has long been thought to help maintain good cholesterol levels. But the disappointing results of a 2011 study tarnished its anti-cholesterol credentials.
