Compound

Probiotics

Mixed findings

Live microorganisms found in fermented foods such as yogurt, kimchi, and natto. Often discussed in relation to gut health; effects appear strain-specific.

Often discussed in relation to

Gut health Digestion

Commonly noted

Commonly noted: Probiotics are live microorganisms — commonly Lactobacillus, Bifidobacterium, and the yeast Saccharomyces boulardii — found in yogurt, other fermented foods, and dietary supplements.
Higher intake: Probiotics are generally well tolerated in healthy people, with gas or bloating sometimes reported; caution is commonly discussed for people who are severely ill or have a weakened defense system.

Source: NCCIH

Often discussed in relation to

Commonly noted

Foods and products containing it