Thank you’ve been looking, but can’t find a place to buy any
As usual the answer is it’s already some foods = eat healthy. I did web search:
Foods like sauerkraut, bananas, fruits, whole grains, asparagus, barley, legumes, oats, vegetables, yogurt, chicory, garlic, and Jerusalem artichoke can be beneficial for the gut microbiome, which includes Bacteroides vulgatus. These foods are rich in prebiotics, which are non-digestible foods that stimulate the growth of beneficial bacteria like B. vulgatus.