Which statement is included in the probiotic definition?

• A. Probiotic products contain an adequate dose of live microbes that have been documented in target-host studies to confer a health benefit
• B. Probiotics require no strain specification
• C. Probiotics are any live microorganisms added to food
• D. Probiotics are always killed before consumption

Answer: (C)

Probiotics are defined by being live microorganisms that, when administered in adequate amounts, confer a health benefit to the host, with evidence supporting that benefit in the target population. This means two key elements: the quantity must be sufficient (adequate dose) and there must be demonstrated benefit from studies in people or animals that resemble the intended target host.

The statement that fits this definition emphasizes both the adequate dose and the evidence of a health benefit from target-host studies. It aligns with how regulators and scientific bodies view probiotic products: not just any live microbe in food, but a specific strain or strains used at an effective amount with demonstrated effects.

Why the other ideas aren’t part of the probiotic definition helps clarify the concept. Saying a probiotic is any live microorganism added to food ignores the need for proven health benefit and appropriate dosing. Probiotic effects are often strain-specific, so simply having a live microbe in food without documented benefit or proper specification isn’t sufficient. And probiotics are not required to be killed before consumption; by definition, they exert effects as live organisms in the host.