As Jiang Fei thought of these considerations, he decided to agree to Zhang Song's request to work together. Jiang Fei was not stingy about supplying the potions. After all, these things cost very little to Jiang Fei. He could produce truckloads of these potions without expending much energy.
Moreover, although these potions did not help in curing diseases, they would still lower the risks in medical operations as patients' wounds would recover much faster with the help of these potions.
Even if the Zhang family sold these potions at a high price, Jiang Fei would still end up indirectly saving the lives of many through supplying these potions.