When the addition of Sal or F‐Sal to cultured C2C12 myoblasts with dexamethasone‐induced sarcopenia, the expression level of the muscle‐forming gene MyoD was significantly increased in F‐Sal compared to Sal (p < 0.01), and the expression level of the muscle‐degrading gene MuRF1 was significantly decreased in F‐Sal compared to Sal (p < 0.01). The gene discussed is MYOD1; the disease is sarcopenia.