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The Short-Term Timeline: Days 3 to 7 By the end of the first week, the initial surge settles into a steadier supply of B12, and this is often when the more noticeable day-to-day changes appear
Temporarily discontinuing self-initiated supplements whilst awaiting medical review is reasonable if symptoms are troublesome, particularly if you began supplementation without confirmed deficiency
It does not interact with GLP-1 receptors, does not slow gastric emptying, and has no effect on hunger or satiety signals in the brain
Treatment should start urgently and should not be delayed for laboratory confirmation if neurological features strongly suggest B12 deficiency
In such cases, injections ensure adequate levels
The diagnostic process typically involves: Clinical history taking, focusing on symptoms (fatigue, neurological changes, dietary habits) Physical examination for signs of anaemia or neurological impairment Blood tests including full blood count, serum B12, and often folate levels Additional investigations such as intrinsic factor antibodies or parietal cell antibodies if pernicious anaemia is suspected For borderline results, additional tests like holotranscobalamin (active B12) may be considered NICE guidance recommends that treatment should commence based on clinical presentation if neurological symptoms are present, without waiting for laboratory confirmation, as delays can result in irreversible nerve damage
