A rating looks like proof. It is better treated as a clue.
What the page says
It shows 4.9 out of 5 from 9,280+ reviews and calls it the distributor's own average, seller-published and not independently audited. The three displayed testimonials score 5, 5 and 4, about 4.7 on average, a tiny sample.
How to read it sensibly
The page does not say where reviews came from, how they were verified or over what period. Treat the number as directional. Look for independent reviews, read recent ones, and pay attention to what people say about routine and refunds rather than only stars. Your own log will tell you more than any average.
Educational note: This guide is general information based on the Quiet Nerves page. Statements have not been evaluated by the Food and Drug Administration. The product is not intended to diagnose, treat, cure or prevent any disease. Individual results vary.