Super easy to make just some eggs and msg and the original innoculant bottle or a source of bacteria from nature. You also need some sun

I have been using it to prevent and treat phytophora aka root root. It retasks this pathogen into something that is beneficial for trees shrubs etc even to the point I can replant the same type of tree in the area of the tree that succumbed to the root rot. It can also feed in multiple different ways and helps plants grow in general which is why it's in 'effective microbes' found in the terra preta of the Amazon so it's likely in healthy people too.

It's very useful in general PNSB is a term for these types of bacteria Rhodopseudomonas Palustris is a species of that term if you want to read more about it. There is another one in those bottles too but the Latin is escaping my brain right now.