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Description
B 12 Recommended Dietary Allowance Versus Recommendations for Optimal B 12 Intake Based on Other Scientific Criteria The RDA of vitamin B 12 for adults is set at 2.4 g/day in the United States.15 The RDA guidelines state that 10% to 30% of adults older than 50 years often have B 12 malabsorption syndromes, driving absorption rates as low as 1% of the ingested B 12
Both options are designed for convenience and gradual, steady metabolic improvement
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