mtrr b12 injections MTR and Genes: Methylation cycle and the need for Vitamin Vitamin B12 deficiency | Nature
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Children from 03 to 10 years 11 months: This group has a special rate and we share rooms with their parents

Notably, within the first two hours after infusion, no discernible increases in plasma or urine levels of NAD+ or its metabolites were seen, indicating quick and thorough tissue absorption and/or metabolism (at least for the first 2 hours) (1)
Am J Physiology-Heart Circulatory Physiol (2020) 319(4):H730H43

You might see it more clearly if you hold the vial against a white background
