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The people who found closer to 50% in their urine probably had a slight vitamin B12 deficiency, and some of the vitamin was stored for later use
Using them can mean failed drug tests, suspensions, and lost titles
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Adequate B vitamin availability supports: Normal digestive enzyme activity Maintenance and repair of the intestinal lining Neural signaling involved in GI motility Effective nutrient absorption This makes B-complex particularly relevant for individuals with altered intake, impaired absorption, or increased gastrointestinal stress
BMJ 2021:372
Oral pills, conversely, must navigate the digestive system, resulting in significantly lower absorption rates (estimated at 1-2%)
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