Clinically proven means the manufacture proved it does what they claim in a controlled environment. The other side of this is it is usually the manufacturer that runs, and oversees the test. If they use an outside firm to do the study then they can can use the word “Independent” in their claims. Most “non-slanted” studies will tell you who did the study. Another thing to consider is the product could have been tested 100 times and if it passes once, they can use the “clinically proven” tag on it.