Perque Bone Guard Forte 100t combats brittle bones, bone loss by using strontium to enforce bone density, Vitamin D3 for absorption and promotes the overall health of the user's bones. Recommended use: 4 tabs daily in divided doses with meals or as directed by a healthcare professional. Healthy bone maintenance 2-4 tabsules/day. Family or personal osteoporosis risk 4-6 tabsules/day. Repair or known osteoporosis 6-8 tabsules/day. Bone Guard Forte Facts: 4 Tabsules contain: Vitamin C (100% l-ascorbate, fully reduced, corn free) 200 mg Vitamin D-3 (as (cholecalciferol) 10 mcg Vitamin K-1 (as phylloquinone) 750 mcg Vitamin K-2 (MK-4) 250 mcg Biotin 250 mcg Calcium (as acetate, glycinate, succinate, malate, fumarate, and citrate) 500 mg Magnesium (as acetate, glycinate, succinate, malate, fumarate, and citrate, and C16 and C18 alkyls) 500 mg Zinc (as citrate) 10 mg Manganese (as citrate) 15 mg Chromium (as citrate) 250 mcg Selenium (as 100% l-selenomethionine) 250 mcg Copper (as sebacate) 1 mg Iodine 3 mg Iodide (as potassium iodide) 150 mcg Boron (as citrate) 6 mg Vanadium (as citrate) 250 mcg Silica (from calcium silicate from horse tail/equestum) 10 mg Strontium (as citrate) 50 mg Vegetable fiber (organic croscarmellose) 400 mg Other Ingredients: None.