They also support the nervous system and help maintain the muscles used for digestion. Different B vitamins play different roles, particularly in their support of the nervous system. They relieve stress, depression, irritability, and fatigue, and also help reduce some effects of aging. When under the pressures of stress or infection, the body needs greater supplies of B vitamins. The body does not store excess B vitamins, so they must be regularly consumed.
B vitamins can also help relieve morning sickness.
Biotin, one of the B vitamins that brewer's yeast supplies, has been shown to strengthen brittle nails and improve the health of hair. It also is used to treat infant cradle cap. Biotin helps people with diabetes use insulin more efficiently and is useful for treating diabetic neuropathy. Brewer's yeast is also an important source of chromium. The U.S. FDA recommends 120 mcg of chromium daily, but 90 percent of Americans are deficient in this important mineral.