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17 December, 12:04

Researchers are conducting a study to determine the effects of vitamin d on the human body. the study involves providing pills that contain vitamin d to one group of human subjects and pills that do not contain the vitamin or other active ingredients to another group of people. the pills that do not contain vitamin d are

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  1. 17 December, 12:49
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    It's called a placebo basically sugar pills.
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