It is an objective that is within reach
There is no established tolerable upper intake level (UL), so even high-dose injections are safe because your system simply eliminates what it cannot use
Its way better to go to the ER and be told, Your heart is fine, its just a symptom of XYZ and know that for the future than not go and worry or actually have a serious problem. Let your doctor and rheumatologist know if you visit the ER and get treated for heart palpitations
Several factors can impair B12 absorption: Reduced stomach acid production (achlorhydria or hypochlorhydria), common in older adults and those taking proton pump inhibitors or H2-receptor antagonists long-term, impairs the release of B12 from food proteins Pernicious anaemia , an autoimmune condition destroying parietal cells and reducing intrinsic factor production, completely blocks the primary absorption pathway Gastrointestinal disorders including Crohn's disease, coeliac disease, or surgical removal of stomach or ileum sections directly damage absorption sites Metformin , commonly prescribed for type 2 diabetes, may reduce B12 absorption through unclear mechanisms
