Does Gut Microbiome and Probiotics work?

The current Migaku evidence database contains 2 reusable source documents for Gut Microbiome and Probiotics. This answer focuses on strength of evidence and what the studies can or cannot prove. - These bacteria have been found to modulate immune responses that are associated with many diseases such as Crohn’s, irritable bowel syndrome, celiac, cardiovascular, and rheumatic []. [Abboud Myriam (2019); evidence level 3] - There is no convincing evidence of the role of GM in the development of bone formation and destruction []. [Abboud Myriam (2019); evidence level 3] - Estrogen cessation gives rise to two stages of bone loss: an early rapid loss of trabecular and cortical bone due to increased osteoclast activity and decreased osteoclast apoptosis, and a second slower prolonged loss due to decreased osteoblast activity []. [Abboud Myriam (2019); evidence level 3] - 1 2 3 Gut microbiome (GM) is the largest one that includes trillions of bacteria, fungi and viruses that live in the intestinal tract. [Abboud Myriam (2019); evidence level 3] - Alcohol-associated liver disease (ALD), a significant cause of chronic liver disease worldwide, is strongly linked to gut microbiome dysregulation. [Liang X (2026); evidence level 4] Evidence levels are sorting aids, not final clinical grades. Level 1 usually indicates systematic-review style evidence, level 2 indicates randomized trials or public-health guidance, and lower levels need more cautious wording. This page is educational. People with medical conditions, pregnancy, medication use, or unusual symptoms should ask a qualified clinician before changing supplements, medication, or treatment routines.