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Use: Helps the body use nutrients; good for the nervous system; helps form red blood cells Sources: Beans, egg yolks, fish, kidney, liver, nuts, peas, tomatoes, yeast Deficiency: Uncommon but may result in hair loss, dry skin, cracking along the mouth, dry eyes, loss of appetite, fatigue, insomnia, depression Excess: Baldness, vision problems. Do not give supplements to children without talking to your pediatrician.Photo by Junko Kimura/Getty Images