Psychiatry 8 , 195208 (2003)
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Diagnosing Vitamin B12 Deficiency in the UK Diagnosis of vitamin B12 deficiency in the UK follows a structured approach combining clinical assessment, biochemical testing, and investigation of underlying causes, as outlined in guidance from NICE and the British Society for Haematology
Direct Dosage: A single B12 injection often delivers a much higher dose directly into the system than a typical daily oral tablet, particularly when considering the limited absorption rate of the latter, contributing to their perceived and actual strength. However, for individuals with mild dietary deficiencies and no underlying absorption problems, high-dose oral B12 supplements (e.g., 1000-2000mcg daily) can sometimes overcome the need for intrinsic factor by allowing for a small amount of passive absorption, eventually raising levels, though this method is less predictable and slower than direct injection
It can also be debilitating at times
This does not affect their quality or genuineness