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(1996) [Effect of vitamin B12 on sleep quality and performance of shift workers]
"Food Labeling: Revision of the Nutrition and Supplement Facts Labels" (PDF)
Endocrinology 148 (10), 46584666
High-dose supplementationparticularly intramuscular injections that can deliver 1,000 micrograms or morecreates substantially elevated serum B12 levels compared to dietary intake, which may more readily trigger these bacterial changes, though comparative studies between different forms are limited
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