According to the World Health Organization, a probiotic is “a live microorganism which when administered in adequate amounts confers a health benefit on the host.”

Probiotics are bacteria and yeast that are found naturally in foods, particularly fermented foods like aged cheeses, kefir, kombucha, kvass, miso, natto, pickles, sauerkraut, sourdough and yogurt. They include species like lactobacillus, bifidobacterium, saccharomyces, bacillus, escherichia, enterococcus and streptococcus.

Those bacteria are generally regarded as safe for human consumption by public health regulatory bodies. They are not pathogenic and do not produce disease in those who consume them. They are reported to confer health benefits including better digestion, regular bowel movements, decrease in gas and bloating, immune system function and better health in general.

In the last 20 or 30 years, probiotic bacteria have become widely available as a nutritional supplement in health food stores and pharmacies. These products have been transformed into capsules, tablets, powders, gummies and drinks. They are purported to improve a wide range of health conditions. They have been widely recommended by doctors and health and nutrition experts for a plethora of ailments.

One of the most perplexing issues is how to choose a probiotic that is best suited for your individual health issues and unique........

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