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B12 is water-soluble, so your body uses what it needs, stores a small amount in the liver, and passes most of the excess in urine
The largest and most predictable of these GH peaks occurs about an hour after onset of sleep with plasma levels of 13 to 72 ng/mL
Rx B12 and Rx B12 Forte are made by the manufacturer Rx Vitamins
doi:10.4021/JEM.V3I1-2.157 Heffernan M, Summers RJ, Thorburn A, et al
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