"Probiotics​" are often used in dairy advertisements to promote the health benefits of the product. However, not long ago, "New Scientist" magazine published an article saying that probiotics are basically useless and may even be harmful. The article pointed out that the survival status of probiotics in the gut varies from person to person, and there is no universal probiotic for everyone.

Promote digestion and absorption. Food usually stays in the intestine for more than 12 hours. During this period, probiotics can promote the synthesis of various digestive enzymes to extract various nutrients from food. For example, the short chain fatty acids decomposed by colonic flora through fermentation can promote the absorption of calcium, magnesium and iron in the colon