Exists in 3 forms and is a cofactor for more than 50 different enzymes. It is involved in carbohydrate and lipid metabolism and plays a role in the action of steroid hormones. Vitamin B6 is involved in more bodily functions than almost any other single nutrient. It is beneficial in controlling water retention. Deficiency can result in anemia, nausea, headaches, dry skin, fatigue, and impaired memory.