Which of the following is a significant benefit of probiotics?

Probiotics are live microorganisms that, when administered in adequate amounts, confer health benefits to the host, specifically in enhancing digestive health. They contribute to a balanced gut microbiome, which is crucial for effective digestion and nutrient absorption. Probiotics can help prevent or treat conditions such as diarrhea, irritable bowel syndrome, and certain gastrointestinal infections by maintaining or restoring the natural balance of gut bacteria.

The other options do not accurately reflect the nature and benefits of probiotics. Probiotics are not harmful to health; rather, they are known for their positive effects when consumed appropriately. Furthermore, they are typically derived from natural sources, such as fermented foods, rather than solely from synthetic origins. Lastly, while some individuals may experience allergic reactions to specific strains or ingredients in probiotic products, this is not characteristic of probiotics in general. Therefore, the assertion that they enhance digestive health represents an essential and well-supported benefit of these microorganisms.