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Timeline of effects: what youll notice If you are wondering what do B12 shots do in terms of a timeline, the results arent always instant, but they are often more noticeable than oral vitamins
1.2 mg for females Age 1950: 1.3 mg (regardless of sex) Age 51 and up: 1.7 mg for males
PubMed , Journal of Physiology, Paris , vol
Downstream saturation / spare receptor full physiological response often achieved well below full occupancy because the cells downstream signaling pathway has its own ceiling
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