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Effects felt within 2472 hours of first injection

It does not allow an enzyme IC 50 or a cell-culture concentration to be converted into a dose

11 Bone marrow suppression is common and potentially affects all cell lines, with megaloblastic anemia being most common

So people at greatest risk for deficiency include those with low stomach acid (e.g., older adults and people on proton pump inhibitors or antacids) or low IF production (known as pernicious anemia), people on medications that interfere with B12 absorption (such as metformin), people who have had gastric surgery, those with GI conditions that impair nutrient absorption (like celiac or Crohn's disease), and people on vegan and vegetarian diets

Compounding pharmacies create these formulations as an alternative to brand-name products like Ozempic and Wegovy