Safety and Side Effects Most people tolerate B12 injections well, but like any injection, they may cause temporary discomfort, redness or soreness at the injection site
Interestingly, most people are deficient in vitamin B12, especially vegetarians or vegans, and persons with specific diseases
Int J Mol Sci 16(9):2019520211 Toki S, Newcomb DC, Printz RL, Cahill KN, Boyd KL, Niswender KD et al (2021) Glucagon-like peptide-1 receptor agonist inhibits aeroallergen-induced activation of ILC2 and neutrophilic airway inflammation in obese mice
Signs of low vitamin B12 include: Fatigue Nausea Throwing up Diarrhea Losing weight without trying A sore tongue A yellow tinge to your skin Fuzzy thinking Numbness or tingling in your hands and feet Vision changes Trouble walking or speaking Feeling easily irritated Confusion Depression Many conditions share these same symptoms
Endocrinology , 146 (7), 30523058