Evidence supporting the use of: Bifidobacterium longum
For the health condition: Lactose Intolerance

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Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Bifidobacterium longum is a probiotic bacterium that has been studied for its potential effects on lactose intolerance. Scientific evidence suggests that B. longum may help alleviate symptoms of lactose intolerance by producing the enzyme beta-galactosidase (lactase), which breaks down lactose in the gut. Several clinical studies and in vitro experiments have demonstrated that supplementation with certain strains of B. longum can improve lactose digestion and reduce symptoms such as bloating, cramping, and diarrhea in lactose-intolerant individuals.

For example, a randomized, double-blind, placebo-controlled study published in the American Journal of Clinical Nutrition (1995) showed that yogurt containing Bifidobacterium longum improved lactose digestion in adults with lactose intolerance. Further, a review in Nutrients (2016) highlights that Bifidobacterium species, including B. longum, can enhance lactose fermentation in the colon, thereby reducing the risk of gastrointestinal symptoms. However, while the evidence is promising, most studies are of moderate quality, often involve small sample sizes, or use yogurt or fermented milk as the delivery vehicle, which may themselves aid lactose digestion.

In summary, there is a moderate level of scientific support (evidence rating: 3 out of 5) for the use of Bifidobacterium longum in managing lactose intolerance, particularly as an adjunctive probiotic therapy, but further large-scale and well-controlled studies are needed to confirm its efficacy and define optimal dosing.

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