can i inject vitamin b12 subcutaneously Injections at Home - Safety Guide for Self-Administration Treating Severe Vitamin B12 Deficiency

A borderline range of 200300 pg/mL may require further testing, such as MMA (methylmalonic acid) or homocysteine levels, to confirm deficiency and assess the need for supplementation or dietary changes.

doi: 10.1182/blood-2016-03-703439 40 NijhofISGroenRWJLokhorstHMvan KesselBBloemACvan VelzenJet al

This code is active under the Medicare Physician Fee Schedule and is reimbursed separately if covered, although local Medicare carriers are responsible for making coverage determinations in the absence of a national policy

So, its better to monitor your intake and symptoms for long-term health

You experience fatigue when your body doesn't have enough energy, and oxygen is needed to break down meals and create energy