Provided are synthetic bone graft substitutes that include bioactive glass and a carrier. Synthetic bone graft substitutes may include bioactive glass, glycerol and polyethylene glycol. Also provided are bone graft substitutes that include collagen and bioactive glass particles. Example bone graft substitutes may include collagen and bioactive glass particles. Other example embodiments may include Type I Bovine Collagen, an angiogenic agent, such as hyaluronic acid, and bioactive glass. Further provided are methods that include administering the present bone graft substitutes to a mammal, e.g., by surgical insertion of the bone graft substitute into the mammal, either alone or in conjunction with one or more implant devices. Further provided are kits that include the present bone grafts.