PABA is a member of the B complex.  Its most important functions are related to the use of folic acid and B5, pantothenic acid, by the body.  As an antioxidant PABA protects the cell from damage and prevents the oxidation of other vitamins and nutrients.  It does this by neutralizing free radicals.  They are unstable molecules that in their bid to become more stable must bump into healthy cells and cause damage.

PABA protects the body from sunburn, skin cancer, second hand smoke, ozone and other air pollutants.  It is used to increase flexibility and decrease inflammation in arthritis sufferers.  It has been reported to reverse the greying of hair due to stress or poor nutrition.  PABA can slow the rate of hormone metabolism in the liver thus enhancing the effects of estrogen, cortisone and all other hormones.  This may be beneficial for menopausal symptoms caused by low hormone levels.

All of the B vitamins work together and are best used by the body in a B complex, which is why many B complex supplements include a small dose of PABA in them.  If additional supplementation of PABA is needed it should be taken in addition to a good B complex. Most B vitamins are water-soluble and any extra from large doses is flushed out of the body easily, therefore it's best to take lower dosages of the B complex several times a day than one larger dose.  Spray or sublingual forms of B vitamins are easily absorbed, as are capsules - if your digestion is healthy, then the tablet form is usually suitable for most people.

PABA is depleted by the use of estrogen, sulfa drugs, alcohol and food processing techniques.