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Their actual concentrations are often different from the label, and some may even contain contaminants

To improve muscular efficiency and endurance during training

Loss of appetite and weight loss: A reduced appetite can be a telltale sign, potentially leading to weight loss

A deficiency can occur for several reasons, such as pernicious anemia (a condition where the body cannot absorb vitamin B12 from the diet), certain medical conditions (e.g., Crohn's disease, celiac disease), surgical removal of part of the stomach or intestine, or strict vegetarian/vegan diets if not adequately supplemented

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