But if fatigue comes with dehydration, stress, or poor recovery, an IV drip provides a broader solution
2 Folate supplementation can correct these haematological effects of B12 deficiency but not the neurological complications, which include neuropathies, such as tingling and numbness in the arms and legs, sensory and motor disturbances, including abnormal gait, and cognitive changes
doi: 10.1111/j.1939-1676.2005.tb02676.x
PMID 9562034
For easier dosing calculations, many practitioners use: 2 mg vial + 2 mL bacteriostatic water = 1 mg/mL (1,000 mcg/mL) 5 mg vial + 2 mL bacteriostatic water = 2.5 mg/mL (2,500 mcg/mL) Step 3: Draw Bacteriostatic Water Clean the rubber stopper of the bacteriostatic water vial with an alcohol prep pad
At this point, there is insufficient evidence to recommend B12 supplementation for fatigue beyond correcting a deficiency