Is the use of yeast to enlarge tomato fruits in greenhouses permissible or forbidden, and does it have any harms for humans?

Among the merits of Islamic law is its prohibition of harming oneself and others, and its prevention of means leading to forbidden acts. If it is proven that using the aforementioned yeast harms those who consume the fruits, then its use is impermissible. Determining whether it is harmful or not falls to specialists.