Yes, 162 pg/mL is low and consistent with
vitamin B12 deficiency. It can contribute to fatigue, weakness, tingling/numbness, and concentration difficulties.
If there are no significant neurological symptoms or malabsorption issues, oral B12 supplementation is usually sufficient; injections are generally reserved for severe deficiency, neurological symptoms, or malabsorption.
It’s also important to identify the cause and monitor the response to treatment.
Next Steps
would recommend discussing the dose and duration with your doctor after reviewing your CBC, MCV, folate level, diet, medications, and clinical symptoms.