Thankfully, it is also very rare but lets not take our chances
Murray DB, McLarty-Williams J, Nagalla KT, Janicki JS (2012) Tryptase activates isolated adult cardiac fibroblasts via protease activated receptor-2 (PAR-2)
Materials and Methods Overview of Study Written informed consent, approved by the Institutional Review Board of Thomas Jefferson University, was obtained from all subjects and the study was registered on clinicaltrials.gov with the following identifier: NCT03032601
Regular exercise is also beneficial after a B12 shot, as it promotes circulation and enhances the absorption of vitamin B12
Improved Mobility: Increases flexibility and joint mobility, particularly important for athletes and the elderly
Its often suggested for those with serious B12 deficiency or poor gut absorption