This work demonstrates the addition of a number of naturally occurring proteins/polymers to a zinc based glass polyalkenoate cements (GPCs). Chitin (Chi.), collagen (Col.), cysteine (Cys.) and keratin (Ker.) were added with the intention of improving the bioactivity of this cement. Initial testing involved characterization of the glass with X-ray diffraction (XRD) and differential thermal analysis (DTA) before and after sterilization with gamma-irradiation. No significant changes occurred as a result of sterilization. Handling properties of the modified cements were not significantly different from those of the control, BT 101 (Working T (w)-36 s, and setting time T (s)-70 s) except for Chi. (30 s, p a parts per thousand currency sign 0.016) and Cys. (105 s, p a parts per thousand currency sign 0.0001) respectively. Comparison of the mechanical properties of BT 101 (compression-sigma(c) and biaxial flexural-sigma(f)) to the modified cements revealed a significant decrease in sigma(c) with Chi. and Col., after 1, 7 and 30 days. However, there were little changes occurring in sigma(f). Cement structural testing was investigated and found that the addition of these polymers greatly reduced the cements surface area, however, the only significant change to occur in the solubility testing was Ker. (p a parts per thousand currency sign 0.009). Simulated body fluid (SBF) testing resulted in increased calcium phosphate (CaP) deposition of Chi. and Col. compared to BT 101. Cell culture studies determined only Col. significantly increased (p a parts per thousand currency sign 0.0001) in comparison to the control cement.