Answer:
The results of available testing involve large groups of people.
Step-by-step explanation:
Test results when available, often reflect a study with only a very small number of people with no reproducible results. Herbal products are classified as dietary supplements and are not required to go through premarket testing and approval by the FDA. The incidental ingredients in many of herbal products are not known. Typically the active ingredient that is identified in similar products is highly variable.
Not my answer