Synopsis

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

Bifidobacterium lactis is a probiotic bacterium that has been studied for its potential effects on stress and related symptoms. The connection between gut health and mental health, often referred to as the "gut-brain axis," is an area of increasing scientific interest. Some clinical studies and animal research suggest that supplementation with certain probiotic strains, including B. lactis, may modulate stress responses by influencing the gut microbiota, reducing inflammation, and affecting neurotransmitter production.

For example, a randomized, double-blind, placebo-controlled trial published in 2017 found that a combination of B. lactis and Lactobacillus acidophilus reduced psychological distress in healthy volunteers (Messaoudi et al., 2011). Other studies have shown that B. lactis supplementation may reduce cortisol levels and improve subjective reports of well-being, although these effects are sometimes modest and may depend on the specific strain used and the population studied.

Overall, while there is scientific rationale and some preliminary human data supporting the use of B. lactis for stress, the evidence is not robust or conclusive. Larger, high-quality clinical trials are needed to establish clear benefits. The current evidence base would be rated as "preliminary but promising," justifying a moderate score for scientific support.

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