Human Microbiome Changes After PBM in Parkinson's (2022)
Retrospective human study reporting microbiome shifts after PBM in Parkinson’s disease.
Why this is relevant
This retrospective human study is not a gut-disease trial, but it offers real-world evidence that PBM may shift microbiome patterns in people.
How to interpret it
Useful as an early human signal, but not direct proof of symptom improvement for IBS, IBD, or other GI diagnoses.