A large research trial using a _____ supplement was stopped early due to evidence of possible harm.

Name: A large research trial using a _____ supplement was stopped early due to evidence of possible harm.
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Question

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Large research trials on beta-carotene supplements showed evidence of increased risk of lung cancer and cardiovascular disease, leading to the trial being stopped early. Vitamin C, vitamin D, calcium, and magnesium supplements have not shown evidence of harm in large research trials.

A Large Research Trial Using a _____ Supplement Was Stopped