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Testing is warranted when one or more of the following apply: Significant appetite loss lasting more than 3 months on stimulant therapy Concurrent metformin use Vegetarian or vegan diet Age over 50 (gastric acid and intrinsic factor production decline) History of gastric surgery, celiac disease, or Crohn disease affecting the terminal ileum New-onset fatigue, paresthesias, or cognitive complaints that do not match ADHD symptom patterns Which Labs to Order Serum B12 alone has limited sensitivity

(2000) The combination of insulin-like growth factor I and insulin-like growth factor-binding protein-3 reduces insulin requirements in insulin-dependent type 1 diabetes: evidence for in vivo biological activity

Where to Get B12 Shots B12 shots can be obtained through healthcare providers, clinics, or reputable online medical platforms

Treatment courses can be repeated every 2 months.