doi: 10.1136/bmj.n1448 82
219,224 It is sometimes prescribed along with tamoxifen, another SERM, which may enhance its effectiveness
This is determined by the presence of a molecule called the intrinsic factor that is essential for the absorption of B12 into your system
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doi: 10.1016/S0022-3999(01)00315-4 Summary Keywords Sensewear armband, myalgic encephalomyelitis/chronic fatigue syndrome, vitamin B12 nasal drops, vitamin B12 serum concentration, RAND 36 questionnaire Citation van Campen CLMC, Riepma K and Visser FC (2019) Open Trial of Vitamin B12 Nasal Drops in Adults With Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: Comparison of Responders and Non-Responders