[Probiotics].

Area of Science:

• Microbiology
• Gastroenterology
• Immunology

Background:

• Probiotics are live microorganisms that, when administered in adequate amounts, confer a health benefit on the host.
• The scientific literature, including clinical trials and meta-analyses, provides a basis for understanding probiotic effects.
• Generalizing probiotic benefits across all products and health outcomes is not scientifically supported.

Purpose of the Study:

• To review the current evidence regarding the effects of probiotics as a general class.
• To highlight the need for specific evidence supporting the efficacy of individual probiotic strains for particular health outcomes.
• To emphasize the importance of clear communication regarding the distinct activities of different probiotic products.

Main Methods:

• Systematic review of well-designed clinical trials.
• Analysis of meta-analyses and relevant scientific literature.
• Evaluation of evidence for probiotic efficacy across various health outcomes.

Main Results:

• Sufficient evidence supports the concept that certain probiotics provide health benefits.
• The efficacy of probiotics is strain-specific and outcome-specific.
• A clear distinction between different probiotic products and their activities is necessary.

Conclusions:

• The benefits of specific probiotics are supported by scientific evidence.
• Probiotic efficacy is not universal and depends on the strain and health condition.
• Enhanced communication is needed to inform consumers and healthcare providers about distinct probiotic product activities.