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B12 deficiency can give rise to numerous health issues, from persistent fatigue to more severe problems such as cognitive complications

104,105 Compounding the problem of oxygen delivery is that the rate of regional blood inflow to the inner and outer medulla is lower than that to the renal cortex

Common signs include: Fatigue Weakness Anemia Pale or yellowish skin Numbness or tingling in the hands and feet Difficulty with balance Glossitis (a swollen, red tongue) Memory or concentration difficulties If you suspect you may have a vitamin B12 deficiency, consult your healthcare provider for appropriate testing and personalized recommendations

Mechanical counter, not syringe-barrel guessing

What I can tell you is what I observe

You also assess how you feel and adjust the dose if needed