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Your serum levels of B12 are notoriously inaccurate and are not necessarily a good measure of the general B12 status of your body

Moreover, some of these studies used dietary intake assessment methods to measure micronutrient status

If you can't establish a consistent meal pattern, you'll get suboptimal results no matter when you dose

doi: 10.1038/s41591-019-0675-0 137 HantsooLKornfieldSAngueraMCEppersonCN

If you still suspect a deficiency despite a normal test, asking your doctor about these more specific markers is a great next step

In NMR analysis, amide protons and alpha-carbon environments may produce distinguishable signals consistent with peptide-like frameworks