What of the following is the most reliable source of information about the effectiveness of a nutritional supplement?
A) the results of a randomized double-blind intervention trial that compared the nutritional supplement to a placebo.
B) Two hundred people describing their use of the nutritional supplement and how it improved their health.
C) A study that compared the health of users of the nutritional supplement with non-users,corrected for confounding factors.
D) A study that compared the health of users of the nutritional supplement with non-users,uncorrected for confounding factors.
Correct Answer:
Verified
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