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Understanding this distinction helps explain why tirzepatide produces greater weight loss in head-to-head comparisons

The burden of proof shifts

Vitamin B12 (also known as cobalamin) is a water-soluble vitamin that plays a key role in: Normal red blood cell formation Normal energy-yielding metabolism Function of the nervous system Reduction of tiredness and fatigue DNA synthesis Normal psychological function In the UK, these are recognised health claims for vitamin B12 under authorised nutrition and health regulations

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Equal proportions reflect the equal weight of the two mechanisms in the conceptual framework