A. Sweat
B. Tears
C. Injections
D. Urine
Explanation:
Water-soluble vitamins usually are excreted in the urine of humans. Thiamin, riboflavin, vitamin B6, vitamin C, pantothenic acid, and biotin appear in urine as free vitamins (rather than as coenzymes); however, little free niacin is excreted in the urine.
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