Testing before treatment is not just a best practice it is the standard recommended by the NIH, the AAFP, and the NICE clinical guideline NG239 (2024)
Restoring B12 levels often results in fewer sick days, especially in post-COVID recovery
(PubMed) Podmore ID, Griffiths HR, Herbert KE, Mistry N, Mistry P, Lunec J
For instance, in one 1960s study of intravenous NAD+ for addiction, patients who received a fast IV drip experienced immediate headache and shortness of breath, whereas those given the same dose at a slower drip rate (under approximately 35 drops/min) had no distress
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