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Benefits of B12 include increased energy, improved sleep and memory, decreased fatigue and increased metabolism
The 28-day window comes from Pfizer/Hospira prescribing information for bacteriostatic water for injection
The staff here are very helpful, empathetic, understanding and compassionate
PMID 19116332
If you are genuinely low in B12, some people notice more energy within a few days, while correcting nerve symptoms or anemia takes longer
Vitamin B12 Supplementation Dietary Changes Addressing Underlying Causes Monitoring Lifestyle Modifications Follow-up Care Vitamin B12 Supplementation Vitamin B12 supplementation is the most common treatment used to relieve the symptoms of deficiency
