The 1994 Dietary Supplement Health and Education Act
A. requires manufacturers of dietary supplements to demonstrate safety and efficacy before marketing their products.
B. directed the FDA to remove ephedra products from the market.
C. expanded the definition of dietary supplements and restricted the FDA's regulatory authority over them.
D. outlawed multi-level marketing schemes for sales of dietary supplements.
C
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The most common of the psychoactive substances, used by ________ % of Americans, is caffeine.
Fill in the blank(s) with the appropriate word(s).
Each July, researchers visit the Briarwood Retirement Community. They conduct tests of physical and cognitive functioning with residents, who have been participating in the research for the past 15 years. Which of the following are the researchers using?
a. sequential design b. longitudinal study c. cross-sectional study d. meta-analysis