Studies that used 1 mg/day in oral and intravenous trials did not show meaningfully better outcomes than lower doses, and higher doses were associated with more reports of headache, diarrhea, and gastrointestinal effects
By dosage, the mean changes were: 500 mcg: 127% 750 mcg: 176% (single study) 1,000 mcg: 280% 1,500 mcg: 310% 2000 mcg: 260% 5,000 mcg: 62% While 1,500 mcg of vitamin B12 showed the highest average increase, the effect plateaued or declined at higher doses, suggesting a possible saturation of absorption pathways
Administering a B12 shot may seem daunting at first, but with proper guidance and technique, it can be a straightforward process
That is why the charts exist