vitamin b12 injection uses Injections: What You Need To Know Vitamin B12 Shots Guide: Benefits

Unlike oral supplements, these injections bypass the digestive system, directly introducing vitamins into the bloodstream

To determine reference ranges, labs test the blood of a large representative population sample (chosen based on characteristics like age, sex, and general health status) and use statistical analysis to identify the middle 95 percent of values for the nutrient in question

Recazens, E., Mouisel, E

The first shows the protection against severe disease among people over 65 and also those over 40, compared to the rates of the disease in the same population before the vaccine took effect

This is due to something called bioavailability