- Did the different brands of Echinacea suggest a similar
(Most likely not. Most brands suggest different doses
that may vary from 200 mg to 1400 mg a day.)
- How do you explain this discrepancy?
(Answers will vary, but that lack of government regulation
is an important reason.)
- Extracts are often made from different parts of an herb.
How might this affect consistency and standardization of
(The different plant part may have different concentrations
of active ingredient. Since the dosage may vary, and since
the ingredients are not regulated, the therapy is at best
activities in this guide were contributed by Michael DiSpezio,
a Massachusetts-based science writer and author of "Critical
Thinking Puzzles" and "Awesome Experiments in Light & Sound"
(Sterling Publishing Co., NY).
Academic Advisors for this Guide:
Corrine Lowen, Science Department, Wayland Public Schools,
Suzanne Panico, Science Teacher Mentor, Cambridge Public Schools,
Anne E. Jones, Science Department, Wayland Middle School,