Each transfer of bacteriostatic water, each vial swirl, and each draw into a syringe carries a small volumetric variance, commonly estimated at 510% per step in non-calibrated lab work [estimate, unverified]
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Focus on taking in protein first, even if that means having to drink your calories with a meal replacement shake (just be mindful of the sugar content in your shakes)
The answer depends on the underlying cause of deficiency and individual absorption capacity
This diagnostic use is less common today, but may be seen in specialized testing
It also states this applies to ads for all vitamin shot products, not just vitamin D or vitamin B12