Original sentence: Alternative medicine practices may be based on non-traditional belief systems or philosophies, biochemical principles or biological observations, and some may not follow the scientific method.If an alternative medical approach is subsequently shown to be safe and effective, it may then be adopted by conventional practitioners and no longer considered "alternative"
Edited sentence: Alternative medicine practices may be based on non-traditional belief systems or philosophies, and some may not follow the scientific method.If an initially untested alternative medical approach is subsequently shown to be safe and effective, it may then be adopted by conventional practitioners and no longer considered "alternative"