"Vitamin B6 is a water-soluble vitamin and is part of the vitamin B complex group. Several forms of the vitamin are known, but pyridoxal phosphate (PLP) is the active form and is a cofactor in many reactions of amino acid metabolism, including transamination, deamination, and decarboxylation. PLP also is necessary for the enzymatic reaction governing the release of glucose from glycogen."
"Vitamin B6 must be obtained from the diet because humans cannot synthesize it. PLP plays a vital role in the function of approximately 100 enzymes that catalyze essential chemical reactions in the human body. "
"Large doses of vitamin B6 can cause, difficulty coordinating movement, numbness, and sensory changes. Deficiency of this vitamin can cause mouth and tongue sores, irritability, confusion, and depression (Vitamin B6 deficiency is not common in the United States.)"
"Vitamin B6 is found in a wide variety of foods. The richest sources of vitamin B6 include fish, beef liver and other organ meats, potatoes and other starchy vegetables, and fruit (other than citrus)."