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Learn more about how these therapies fit into the broader landscape in our guide to the best peptides for weight loss

By comparison, oral B12 supplements are absorbed at roughly 1 to 5% in healthy adults, and even less if you have low intrinsic factor, atrophic gastritis, celiac disease, Crohn's, or a history of gastric bypass

Intravenous iron therapy is quick and effective for severe cases

Injected vitamins are more effective than pill form supplements because they enter directly into the bloodstream, as opposed to first traveling through the digestive tract, then being absorbed into the bloodstream where they lose some of their potency