The Type segment of the Bone Graft Substitutes market is classified into autografts, allografts, synthetic grafts, and xenografts. Autografts, sourced from the patient’s own tissue, dominate the high‑value tier due to superior osteogenic potential, yet their limited supply and donor‑site morbidity constrain overall market share. Allografts, derived from cadaveric donors, provide a broader volume base and are processed to reduce immunogenicity, contributing a sizable portion of the market while balancing cost and clinical efficacy. Synthetic grafts—comprising calcium phosphates, bioactive glasses, and polymer composites—are expanding rapidly because of scalable manufacturing, consistent quality, and the ability to incorporate growth factors; they now account for a growing share of revenue. Xenografts, sourced from animal tissue, occupy a niche role, primarily in dental applications, where their structural similarity to human bone offers a cost‑effective alternative. Collectively, these four categories define the market taxonomy, each influencing total market size through distinct cost structures, regulatory pathways, and clinical adoption rates.