Oh, Hwang, and Lim (2012) reported that the phenolic content of tofu fermented with mushroom mycelia increased with fermentation time. Our results also indicated that the total phenolic content of all four TK groups increased from initial 397.0–474.8 μg g−1 to 528.0–626.8 μg g−1 after 16 weeks. This increase may be due to production of phenolic acids, such as δ-coumaric and ferulic acids, during fermentation and their interaction with microbes, which produced ethyl or vinyl derivatives phenol with the antioxidant activity (Chen & Ho, 1997). Significant implication is seen for use of TK-L with high total phenolic content as a valuable source for development of functional foods.