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Wikipedia has "In the West, no therapies are currently authorized for use on humans, although phages for killing food poisoning bacteria (Listeria) are now in use"

which sounds like a regulatory issue. And a bit of an unnecessary one it seems as the treatments seem harmless to humans.

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It's a regulatory issue, but it's also a clinical one. Even if it gets approved, it will still need a general purpose kit-based form, and that's a massive clinical and scientific hurdle.

Also, phage therapy killed people in the past. Mostly due to poor purification, but it's not inherently harmless.

So has orange juice.

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