Ethanol (95%) and dichloromethane : methanol (DCM : M, 1 : 1 v/v) bark extracts (BEs) and leaf extracts (LEs) of authenticated Ceylon cinnamon (CC) were studied for antiamylase, antiglucosidase, anticholinesterases, and antiglycation and glycation reversing potential in bovine serum albumin- (BSA-) glucose and BSA-methylglyoxal models in vitro . Further, total proanthocyanidins (TP) were quantified. Results showed significant differences (p<0.05) between bark and leaf extracts for the studied biological activities (except antiglucosidase) and TP. BEs showed significantly high (p<0.05) activities for antiamylase (IC 50 : 214±2–215±10 μ g/mL), antibutyrylcholinesterase (IC 50 : 26.62±1.66–36.09±0.83 μ g/mL), and glycation reversing in BSA-glucose model (EC 50 : 94.33±1.81–<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M8"><mml:mn fontstyle="italic">107.16</mml:mn><mml:mo>±</mml:mo><mml:mn fontstyle="...