Do bacteria that use chemosynthesis produce oxygen as well as their food or do they make anything else at all?

Question

I have just recently learned about chemosynthesis where bacteria use it to make their food and i am wondering if there is anything else that they create in addition to food? I already know about photosynthesis and plants making oxygen as well as food and that has caused me to wonder about chemosynthesis. Please answer and thanks for looking!!

Answer 1

Bacteria also produce H2S and CH4.