Unlike enrolling in a formal clinical trial (which has extensive consent forms explaining experimental status), patients at wellness clinics might assume if a doctor offered it, it must be safe or allowed. Such misunderstandings could lead to feelings of betrayal and litigation if things go wrong
For a professional setting, its simply a reliable and comfortable alternative to the arm, providing plenty of muscle mass to absorb the vitamin B12 solution properly
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In fact, studies suggest that when B12 levels drop below a certain threshold, around 253 pg/ml, it can cause changes on an ECG that point to a higher risk for arrhythmias, even in otherwise healthy people