The use of bioactive factors to enhance bone regeneration: A narrative review.

Although there is increasing evidence that bioactive factors might enhance the bone regeneration process, the great heterogeneity of the available studies and the limited number of RCTs do not allow to draw robust conclusions. Issues that still need to be investigated include the optimal carriers for bioactive agents (direct vs. indirect), the dosage, the timing of administration, as well as the possibility of combining different agents to promote synergistic effects.