needle for bac water Practi-Bacteriostatic 1 mL Needled Syringe, Simulated Medication They are available in 100 count Bacteriostatic Sterile Water for Injection
Description
Fatigue is one of the most common symptoms of B12 deficiency, often described as exhaustion that doesnt improve with sleep

R., McPartlin, J

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[185] Additionally, gradient compression garments appropriate for daytime use can inadvertently become repositioned at night while the individual is sleeping and cause a tourniquet effect, essentially cutting off circulation to the limb and resulting in further swelling

For others, it may take a few weeks of consistent use

If harm at high doses is established then perhaps B12 has a therapeutic range, outside of which it causes harm
