why do vitamin b12 injections sting What Happens If You Inject Into Fat? · SQ vs. IM · PA Relief Vitamin B12 shots: Uses, benefits,

Symptoms may include fatigue, weakness, memory problems, difficulty concentrating, mood changes, numbness or tingling in the hands and feet, and difficulty maintaining balance

Khan FY, Yousif AB, Suliman A, Saleh AO, Magdi M, Alshurafa A, Hassan EA, Ghazy A, Salameh OK, Abdallah A (2021) Association of vitamin B12 deficiency with metformin use in patients with type 2 diabetes treated in the largest tertiary care hospital in Qatar

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Vitamin B12 for supplements is made using bacterial cultures and so is always vegan (Fang et al., 2017)