Found naturally in brewer’s yeast, whole brown rice, pumpkin seeds, and apricot seeds, Pangamic Acid (B15) has been used for centuries to help support endurance and fight fatigue. We at Richardson Nutritional Center believe that it works best paired with B17 and Pro Enzymes. We want you to try it, and feel the difference. Works Great With Vitamin B17 (Laetrile™) and Pro Enzymes.