Synopsis

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

Lactobacillus reuteri is a probiotic bacterium that has been investigated for its potential to aid individuals with lactose intolerance. The scientific rationale for its use is based on the general ability of certain Lactobacillus species to produce the enzyme beta-galactosidase (lactase), which helps break down lactose in the gut, potentially reducing symptoms of lactose intolerance. Several clinical studies have demonstrated that consumption of probiotics—especially those containing Lactobacillus strains—can improve lactose digestion and reduce gastrointestinal symptoms after dairy intake. However, while the evidence is robust for some species (such as Lactobacillus acidophilus and Lactobacillus bulgaricus), the specific evidence for L. reuteri is less extensive.

A handful of small-scale clinical trials and mechanistic studies suggest that L. reuteri can survive transit through the gastrointestinal tract and may enhance lactose digestion, but these findings are not as consistently replicated as those for other Lactobacillus species. Some studies have shown a reduction in symptoms such as bloating, cramps, and diarrhea in lactose-intolerant individuals after supplementation with L. reuteri, but others have found no significant benefit. Therefore, while there is a plausible scientific basis and some supportive evidence, the overall strength of the evidence for L. reuteri in the treatment of lactose intolerance is moderate and warrants more high-quality, large-scale studies for confirmation.

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