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
Some patients may experience a transient increase in acne or rosacea-like skin reactions, thought to be related to the effects of vitamin B12 on skin bacteria, though this is uncommon and typically mild
Current use is limited to research purposes under physician supervision
Whether you're newly diagnosed or managing long-term treatment, this guide provides evidence-based information aligned with NICE guidance and UK clinical practice
For some people, an injection makes more sense because it makes nutrients such as vitamin B12, other B vitamins and magnesium much more available
