It has virtually no direct blood supply
A vitamin B12 deficiency can disrupt several systems in the body, causing fatigue, dizziness, shortness of breath, confusion, vision loss, and even depression
Recent findings Recent studies on over 13 000 healthy blood donors, as part of the Recipient Epidemiology and Donor Evaluation Study (REDS) III and IV-P RBC omics, and 525 diversity outbred mice have highlighted the impact on RBC metabolism of biological factors (age, BMI), genetics (sex, polymorphisms) and exposure (dietary, professional or recreational habits, drugs that are not grounds for blood donor deferral)
But we can't stress this enough: you must never, ever inject directly into the tendon itself
PLoS One 9(12):e116565
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