The instructional video is very simple and clear, but also thorough
10.1182/blood.v92.4.1191.416k15_1191_1198 32 La TorreG.CalzoniL.ColamestaV.GuzzoA
The simplicity of the procedure is precisely what creates risk in certain settings
10-12 Week Vial $125 (home delivery) Individual Injection $30 (in-office) 4 Pre-Filled Syringes $90 (in-office) Methyl B12 is for treatment of B12 deficiencies

B12 has many functions in our body, so unfortunately a deficiency will give rise to a wide variety of symptoms, like brain fog, memory problems, cognitive impairment, insomnia, headaches, especially migraine, behavioural changes, learning problems, nominal aphasia, mood swings, irritability, depression, anxiety, hallucinations, delusions, psychosis, peripheral paraesthesia (pins and needles), numbness, neuropathic pains, poor balance, reduced vibration sense or proprioception (joint position sense), tinnitus, ataxia, taste impairment, sometimes myelopathy, fatigue, anaemia (either with larger red blood cells, or with normal size of the red blood cells when there is also iron deficiency), other reduction in blood cells, abdominal complaints, malabsorption, failure to thrive, weight loss, diarrhoea, hyperpigmentation, glossitis, (aphthous) stomatitis, infertility, urinary tract infections, joint and muscle pain, muscle weakness, spasticity, seizures, cardiomyopathy, urinary and/or faecal incontinence, postural hypotension/dizziness, erectile dysfunction, to name a few

Seek immediate medical attention if you develop rash, difficulty breathing, or facial swelling following injection