Continue writing the next sentence.

How to know if weight loss supplements really work
Review published clinical research.
You typically can find articles about published research online that has tested the weight loss claims of specific weight-loss supplements. Keep in mind that researchers define " clinically meaningful weight loss " as at least 5 percent of total body weight over the course of a year.
Unfortunately, it may be difficult to find significant studies on the supplements in which you're interested. When you do find studies, look critically at who conducted the research and for what purpose.