Our expert says:
In the scientific literature on Lactobacillus reuteri, many strains of bacteria were isolated, i.e. chicken reuteri strain, mouse strain, pig strain etc. It was shown that whilst a reuteri strain of animal origin did no harm in humans, the human strain isolated (which is as you rightly say, indigenous to humans) showed the best clinical effect when tested in humans.
So yes, I would rather be safe and take a product of known origin; one that has been thoroughly tested and known to be safe.
By the way, the opposite is also true, we even gave a race horse with diarrhoea Reuteri (human origin)and he was cured!!
Reuteri of interest is known as the universal lactobacillus (it is autochthonous – hope I got that spelling right – this means it has been found in all species tested to date)
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