The NICE guideline recommends that doctors first use one of the primary tests for B12
Some researchers add an extra 0.1mL of bacteriostatic water to compensate, accepting a slightly lower concentration (3.23mg/mL instead of 3.33mg/mL) in exchange for recovering nearly all the peptide
Only so much B12 can pass through it at once before every slot is taken
It is important to note however, that not all forms of vitamin B12 are created equally
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