It is non-toxic and a common phenomenon that cabbage is fried and bitter, so don't worry too much. The reason why it is fried and bitter may be because it is not cooked. If the frying time is too short or the heat is relatively low, it may be cooked and bitter. I suggest frying it for a while.

Another common bitter reason is that cabbage is not fresh enough. If the cabbage bought is left for too long, the water loss will be serious, which will lead to the bitter taste of the fried cabbage. After buying the cabbage, it is best to eat it in time, otherwise it will not only lead to nutrient loss but also affect the taste.