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While B12 injections can support most adults, certain groups consistently benefit more than others: Vegans and vegetarians , given the limited B12 availability in plant-based diets Adults over 50 , as natural B12 absorption declines with age People with GI conditions such as Crohn's, celiac, IBS, or those who have undergone bariatric surgery Anyone on long-term medications that interfere with absorption (PPIs, metformin, certain antacids) Athletes and active individuals with elevated metabolic demand New and expectant mothers , particularly those breastfeeding Busy professionals managing chronic stress and high cognitive load If any of these describe you and the symptoms above sound familiar, a B12 injection is one of the lowest-friction, highest-value places to begin