where do you have a b12 injection How to Inject Vitamin B12 Injections for Energy: Benefits
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Additionally, since your skin regulates the amount of vitamin D your body synthesizes, it is unlikely that you will receive too much vitamin D from the sun

For 99215, the range is 40 to 54 minutes

Okamura T, Tsujitani S, Korenaga D, Haraguchi M, Baba H, Hiramoto Y, Sugimachi K

B12 deficiency can distort HbA1c results, but the direction is variable results may be spuriously low or high depending on the degree of anaemia, red cell changes, and the assay used