l-carnitine levels in energy drinks Drink Liquid L-Carnitine Energy
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This will be challenging given the number of interacting parts between the gut microbiota, metabolites, and host immunity

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Moreover, Lactobacillus rhamnosus GG, a common intestinal bacterium, was successfully co-cultured on the luminal surface of the intestinal epithelium, without compromising epithelial cell viability

In the UK, look for products with appropriate quality assurance, though note that food supplements are not subject to the same rigorous testing as licensed medicines
