Question: Are the enzymes you use naturally occuring in the body or from somewhere else?

Sebastian Cosgrove answered on 6 Mar 2019:

They come from a variety of places actually! There are several commonly used ones that come from horseradish (vegetable), human liver and even egg white, whilst many come from bacteria and fungi. There are tens of thousands of enzymes within the human body, and they will be involved chemical reactions to make useful chemicals for our bodies to survive. What scientists try and do is think about the chemicals that the enzymes produce, then they can try and isolate them from a sample of the organism they grow in and reproduce in laboratory conditions. This way we don’t have to take them out the place we find them from every time (if we had to isolate the one from human liver for example this would need a human liver every time!). We can then engineer them to make them useful, so they do come from natural origins, but we have changed them with genetic engineering so they become mutants, which don’t occur in nature. They are based on naturally occurring enzymes though!