Probiotics can improve absorption. Some plant fibers in food cannot be digested by human intestine, and probiotics can help degrade these carbohydrates and produce short-chain fatty acids. Intestinal flora can decompose nitrogen-containing compounds existing in the digestive tract from food, and promote the digestion and absorption of protein. Probiotics (Bifidobacterium, lactic acid bacteria) can improve the absorption of iron, and phytase of Bifidobacterium can promote the permeability of minerals, especially zinc, and help the intestine absorb minerals from food.