I've not come across a thing (this just by way of giving you a smidgin of feedback Paul).
A casual TV series here in the UK recently showed a piece in a "how our food is produced" theme. They looked at probiotic
products like Yakult. Despite the manufacturers not being too eager to be open about it, apparently the basis of such products is a culture of beneficial bacterial from a sample of faces from someone with a healthy digestion.
These days I find myself ever more cynical towards every sort of health promise from the food, supplement and medical industries. They all seem based on the same formula - that happiness if created by a combination of spending money and putting things in or on our bodies. I'm on quite another trajectory. Less of that, is more for me. Let nature have a chance to repair itself, I've faith in my systems innate ability to repair and adapt if given a chance. Vanilla veg, fruit and seafood is ample for me. I only want for a garden of my own.
Oops, my intent is not to deflect from this thread.