Bioflavonoids and para-aminobenzoic acid (PABA) are essential in our diet for good health

False. Bioflavonoids are a related group of compounds hat occur widely in plant foods, for example, in berries and citrus fruits. Some of them do have biological activity. However, although they were once thought to have some vitamin-like properties, there is no evidence that they are essential dietary constituents. Para-aminobenzoic acid or PABA, like the bioflavonoids, an essential dietary constituent for humans. Examples of foods containing PABA are brewer's yeast, fish, peanuts and eggs.