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It contains benzyl alcohol, which helps prevent bacterial growth and allows for safe multi-use over an extended period
Kale SN, Deore SL
Cell Tissue Res 377, 153159 (2019)
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Key Takeaways Serum B12 alone misses up to 50% of functionally deficient patients always add MMA for confirmation The optimal longevity range for serum B12 is 500900 pg/mL, far above the standard lab cutoff of 200 pg/mL B12 deficiency progresses through four stages, from depleted stores to irreversible neurological damage Methylcobalamin is the preferred supplementation form for most people
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