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Shoulder - make a downward-facing triangle over the deltoid muscle on the upper arm with the thumb and forefinger of the non-injection hand
Even a slight inaccuracy in weighing the initial powder can lead to significant errors in your final solution's concentration
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
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