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Preparations containing benzyl alcohol are contraindicated for pregnant women and children due to potential toxicity risks

That is a very different statement from they do nothing. It means: The mechanistic rationale is real

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Vitamin B12 for Athletes: Dosing and Evidence (2026): The Short Answer Vitamin B12 (cobalamin) is essential for red blood cell production, oxygen delivery, and nerve function, all of which directly affect endurance performance

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Clinical Scenarios for IV Administration IV B12 is very helpful in some situations, like when the deficiency is severe and causing neurological problems, in cases of malabsorption like Crohns disease, or when taking pills doesnt work