inject b12 pills Vitamin Cyanocobalamin injection 1000 mcg Multiple-Dose Vials — Mountainside Medical How to Give a Vitamin
Description
Need for maintenance dose: Need Of Maintenance Dose-Picture Courtesy: Health Cleveland Clinic Initially you administer dose every week for almost 6 weeks

Vitamin B12 supplements do not commonly cause constipation

There are some associated with vitamin B12 injections
[DOI] [PMC free article] [PubMed] [Google Scholar] 82.Ying H, Dey P, Yao W, Kimmelman AC, Draetta GF, Maitra A, et al

What has NICE done

You might need special supplements or different ways to take B12