Evidence supporting the use of: Lactobacillus salivarius
For the health condition: Lactose Intolerance

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Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Lactobacillus salivarius is a probiotic bacterium sometimes included in supplements marketed for digestive health, including lactose intolerance. The scientific rationale for its use is based on the general ability of some Lactobacillus species to produce the enzyme β-galactosidase (lactase), which helps break down lactose in the gut. For lactose-intolerant individuals, this could potentially reduce symptoms such as bloating, gas, and diarrhea after dairy consumption.

However, the direct scientific evidence specifically linking L. salivarius supplementation to meaningful improvement in lactose intolerance symptoms is limited. Most studies focus on other Lactobacillus species—such as L. acidophilus, L. reuteri, or L. rhamnosus—which have more robust data supporting their efficacy in this context. There are a few in vitro studies showing L. salivarius can produce lactase, and some animal studies suggest possible benefits. However, well-controlled, large-scale human clinical trials specifically examining L. salivarius for lactose intolerance are lacking.

In summary, while the theoretical basis for using L. salivarius exists and it shares properties with other better-studied probiotics, the clinical evidence supporting its use in lactose intolerance is weak at present. The evidence rating given is 2 out of 5, reflecting promising but preliminary findings that require further human research for confirmation.

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