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“Relations with some nutrients (vitamins A, C, and E, riboflavin , thiamin, niacin) were at least partly explained by previously identified inverse associations with multivitamin use.”
American journal of epidemiology • 1995 | View Paper
“Individuals in both groups who used multivitamin supplements had significantly higher biochemical values for thiamine (p less than 0.03), riboflavin (p less than 0.01), and vitamin B-12 (p less than 0.003) than nonsupplement users.”