One common indicator is persistent fatigue or weakness
Unlike fat-soluble vitamins (A, D, E, and K), which are stored in fat tissue for long periods, water-soluble vitamins are processed relatively quickly: your body takes what it needs, stores a small amount in the liver, and passes most of the rest in urine
Invert the vial so the needle tip is fully submerged in the liquid (otherwise you will draw air, not peptide)
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You also need vitamin D for other important body functions
In contrast, cyanocobalamin is an inactive, synthetic, slightly-toxic form of B12 that the body must convert