... cavities and the ends of some long bones and most flat bones. Inadults, red marrow is the site of synthesis of redblood cells and certain white blood cells (lympho-cytes of the immune system and ... body of chromium. High levels of biotinseem to assist the liver with carbohydrate and fatmetabolism. NIACINAMIDE, NIACIN, VITAMIN C, VITA-MIN B6, MANGANESE, MAGNESIUM, ZINC, and SELE-NIUM ... RADI - CALS—extremely reactive, damaging forms of oxy-gen and other chemicals. Beta-carotene helps boost the IMMUNE SYSTEM, and it affects lipid metabolismin important ways. It lowers LOW-DENSITY...