Pyridoxine is involved in more bodily functions than almost any other single nutrient.  It affects both physical and mental health.  It is beneficial if you suffer from water retention, and is necessary for the production of hydrochloric acid and the absorption of fats and protein.  It also aids in maintaining sodium and potassium balance, and promotes red blood cell formation.

Pyridoxine is required by the nervous system and is needed for normal brain function and for the synthesis of the nucleic acids RNA and DNA, which contain the generic instructions for the reproduction of all cells and for normal cellular growth.  It activates many enzymes and aids in the absorption of vitamin B12, in immune system function, and in antibody production.

Vitamin B6 plays a role in cancer immunity and aids in the prevention of arteriosclerosis.  It inhibits the formation of a toxic chemical called homocysteine, which attacks the heart muscle and allows the deposition of cholesterol around the heart muscle.  Pyridoxine acts as a mild diuretic, reducing the symptoms of premenstrual syndrome, and it may be useful in preventing calcium oxalate kidney stones as well.  It is helpful in the treatment of allergies, arthritis, and asthma.

A deficiency of vitamin B6 can result in anemia, convulsions, headaches, nausea, flaky skin, a sore tongue, and vomiting.  Other possible signs of deficiency include acne, anorexia, arthritis, conjunctivitis, cracks or sores on the mouth and lips, depression, dizziness, fatigue, hyperirritability, impaired wound healing, inflammation of the mouth and gums, learning difficulties, impaired memory or memory loss, hair loss, hearing problems, numbness, oily facial skin, stunted growth, and tingling sensations.  Carpal tunnel syndrome has been linked to a deficiency of vitamin B6 as well.