The study that found a 47%* reduction (relative to symptoms at the start of the study) wasn't placebo controlled and had a sample size of just 18, so there's no

The study that found a 47%* reduction (relative to symptoms at the start of the study) wasn't placebo controlled and had a sample size of just 18, so there's not even a control group to compare against. > We note that due to the open-label nature of this initial trial, all of the assessments are subject to placebo effect, however the long-term improvements we observed here are promising. https://www.nature.com/articles/s41598-019-42183-0#Sec2 https://www.nature.com/articles/s41598-019-42183-0#Sec2