Most microorganisms, like bacteria and yeast, are harmful, but probiotics are beneficial exceptions that contain helpful bacteria or yeast similar to those in the gut. Common types—such as Lactobacillus, Bifidobacterium, and Saccharomyces boulardii—support digestion, immunity, and overall health, though they may cause side effects in some people.

1. Digestive Issues

Probiotics are tolerable for most people. However, some might experience unpleasant or uncomfortable gastrointestinal problems.

The symptoms may include:

Temporary gas

Bloating

Stomach pain

Constipation

Diarrhea

They occur as the gut microbiome changes , usually appearing when you first start taking probiotics and resolving within a few weeks. If symptoms persist for longer, consult a healthcare provider.

2. Hista

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