b12 injections im or subq Methylcobalamin Injection (Vitamin B12) are vitamin b12 injections given

The FDA considers it a non-toxic substance under the Generally Recognized as Safe (GRAS) classification for specific applications

10.1186/s12986-022-00653-9 171 ZhouQ.HuangZ.-G.ZhuX.-J.XieZ.-H.YaoT.-F.WangY.-H.et al (2018)

As such, having inadequate B12 levels can decrease normal red blood cell production, which can impair oxygen delivery ( Specifically, a deficiency in B12 can cause megaloblastic anemia

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Proper injection technique, including rotation of injection sites and allowing the medication to reach room temperature before administration, may help minimize these local reactions

Dosage may be reduced to 0.5 mL weekly in patients experiencing gastrointestinal intolerance or increased to a maximum of 2 mL twice weekly for short-term metabolic intensification when supervised by a qualified clinician