Its muscle building properties make it a favorite among weightlifters and bodybuilding professionals
Interestingly, at supra-physiologic levels of B12 (to be expected with frequent injections), intracellular levels of B12 may be reduced as I mentioned here : healthunlocked.com/pasoc/po
The right next step is a conversation with a licensed provider who can assess whether it fits your situation, not a purchase based on a forum post
Yes, you can take vitamin B12 and iron together
Injections are favored for severe deficiency, malabsorption (e.g., postGI surgery, chronic diarrhea), very low B12 levels with neurologic signs, poor adherence, or when rapid repletion is needed
The commonly used method is high-performance liquid chromatography, supplemented by other validation methods, as detailed below