Final answer:
Purchasing products labeled as "natural" is not an effective strategy to evaluate the safety and quality of a particular supplement.
Step-by-step explanation:
The strategy that would NOT be effective when trying to evaluate the safety and quality of a particular supplement is to purchase products labeled "natural". Just because a supplement is labeled as "natural" does not guarantee its safety or quality. In fact, the term "natural" is not regulated by the FDA and can be misleading.