The effect of orange fleshed sweet potato extracts on (a) glutathione peroxidase (GPx) activity and (b) Catalase (CAT) activity in treated C2C12 myotubes. Treatment groups were palmitate (PT), palmitate and tubers’ extract of orange fleshed sweet potato (PT + OSPT), palmitate and leaves’ extract of orange fleshed sweet potato (PT + OSPL), palmitate and metformin (PT + M), tubers’ extract of orange fleshed sweet potato only (OSPT), leaves’ extract of orange fleshed sweet potato only (OSPL). Different letters denote statistical significant differences between results (p < 0.05). Bars indicate standard deviation (n = 3).