Perque Bone Guard Forte is a comprehensive physician-grade bone health formula delivering all the key nutrients required for complete bone mineral matrix synthesis and maintenance — going significantly beyond the simple calcium + D3 approach of conventional bone supplements. 240 tablets.Calcium (in highly bioavailable forms — as ascorbate and citrate, not carbonate) provides the primary bone mineral. Magnesium (fully reacted) is required for calcium incorporation into hydroxyapatite and for Vitamin D activation. Vitamin D3 (Cholecalciferol) directs calcium absorption from the gut and mobilization into bone. Vitamin K2 (Menaquinone) activates osteocalcin to incorporate calcium into bone matrix rather than arterial walls. Boron supports estrogen metabolism critical for bone density in women. Silica provides the organic scaffold for mineralization. Vitamin C (mineral ascorbate) is required for collagen synthesis — the organic protein matrix that holds bone mineral together. Perque is a physician-grade clinical nutrition brand founded by integrative medicine pioneer Dr. Russell Jaffe, M.D., Ph.D., known for using only the highest-bioavailability nutrient forms (fully reduced, fully reacted) and rigorous quality standards. Available at Beauty Riche with same-day shipping.