Candida albicans is a naturally occurring yeast that is typically found in the gut as part of the normal gut flora. NOW's Candida Support formula is a combination of traditional herbal ingredients (pau d'arco, black walnut and oregano oil), biotin (a B-complex vitamin) and caprylic acid (a natural fatty acid derived from vegetable oils), which has a strengthening effect in terms of the healthy balance of non-pathological gut bacteria.