is injectable b12 better than oral Injection vs. Supplements: Which One Do You Actually Need? – ELLEMES Medical Spa Vitamin B12 Injections vs. Oral

Excess B12 from oral supplements is poorly absorbed at high doses (the body absorbs roughly 1 to 2% of a 1,000 mcg oral dose) and the remainder is excreted in urine

In such cases, the focus should shift to investigating potential underlying causessuch as myeloproliferative disorders, liver disease, or renal dysfunctionrather than attributing symptoms to the elevated B12 itself

He will also ask about any underlying health conditions that can impact B12 absorption, such as digestive disorders (like Crohns disease or celiac disease), past surgeries (including gastric bypass), or dietary patterns common in families, such as vegetarian or vegan diets

Its not FDA-approved as a drug, and its not a controlled substance under federal law, which puts it in a gray zone