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Go to any health food store and they’ll have a refrigerated section of all the placebo bacteria supplements you could ever want.

You can test if a probiotic is actually alive. They may not provide the effect you want but they’re probably not placebos. The good ones at least.

Test I found if anyone else is wondering.

Can it be done with disposable syringes? They are available cheaply for kids's experiments and sometimes look more anaerobic than saran wraps.

You speak from a position of disparagement but I'm living proof ¯\_(ツ)_/¯

The world has no shortage of “I don’t understand this so it couldn’t be important” in daily life, let alone online.