Collagen Bone with D3, K2, Calcium & Magnesium features Fortibone Bioactive Collagen Peptides that promote remineralization and collagen production at the bones. Collagen is a major component of bone tissue and is important for maintaining bone strength. The collagen peptides in this formula are hydrolyzed to a low 5kDa molecular weight. The right size and sequence for targeting connective tissue cells to stimulate extracellular bone matrix for enhanced collagen building at your bones. And, when you combine these clinically studied bioactive peptides with ultra gentle and highly absorbable forms of vitamin D3, soy-free K2, calcium and magnesium, you ensure the best support for your bones.