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The FDA has not reviewed safety data, efficacy data, or quality control standards for these mixed formulations
The multi-use vial allows repeated access in laboratory settings when handled properly
Metformin treatment of diabetes causes B12 to accumulate in the liver, thus lowering serum B12 concentrations (Allen et al., 2018)
They are independent properties that happen to share the phrase "how long it lasts," and conflating them is one of the most common errors in this topic
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