Low B12 can happen for different reasons
[7] Improved body composition: From a fitness perspective, reducing subcutaneous fat can help reveal muscle definition and improve overall body composition, which are important factors for bodybuilders and fitness enthusiasts
The synthetic form of Vitamin B12, Cyanocobalamin, is often used in compounding pharmacies to formulate B12 injections
Oral Supplements: A Reliable Method On the other hand, oral supplements come in various forms, including pills, capsules, and sublingual (under-the-tongue) formulations
I never got diagnosed because it was too late and my health deteriorated fast
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