This step is very important for the right dose

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

Even those taking supplements may require shots based on testing
Tolerability (early human safety): Short human studies reported a placebo-like safety profile with no serious adverse events [5] [6]
In some cases, a doctor may refer a person to a specialist, such as: a nutritionist or dietitian a hematologist, who specializes in treating blood conditions a gastroenterologist, who specializes in treating gastrointestinal (GI) conditions The table below contains the However, a doctor can advise on an individuals specific needs