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Measurements of serum vitamin B 12 may not reliably detect deficiency, and measurement of serum homocysteine and/or methylmalonic acid should be used to confirm deficiency in asymptomatic high-risk patients with low normal levels of vitamin B 12
Here is a revised and more accurate explanation of the reasons a UK GP surgery might refuse to give a B12 injection a day earlier than scheduled, incorporating the points youve raised and providing a more scientifically grounded perspective: 1
17 Screening should be considered in patients with risk factors, and diagnostic testing should be considered in those with suspected clinical manifestations
"Emerging Use of BPC-157 in Orthopaedic Sports Medicine: A Systematic Review." American Journal of Sports Medicine , 2025
Vitamin D deficiency has been linked to fatigue and low energy, which Vitamin B12 can help counter by aiding in the conversion of food into energy
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