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The oxygen thingy that you put on your finger to measure blood oxygen I bought on Amazon says I have 100% oxygen in my body and my heart rate is at 102bpm

Even considering all of these factors you need to understand that checking vitamin B12 levels in the serum still isnt the best way to evaluate for B12 deficiency

If you have low levels of vitamin B12, you may notice symptoms such as weakness, constipation, tiredness, weight loss, and limited appetite

Medicare Part B covers medically necessary immunizations and reimburses the vaccine product and administration service separately

It also has a tyrosine residue to replace the first amino acid at the N-terminus, which researchers consider to help increase the stability of the peptide