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Researchers found its safety profile was virtually identical to placebo, with no treatment-related serious adverse events reported in any study

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Why ferritin matters: Ferritin can drop long before hemoglobin does, which means you can be iron-deficient and feel awful while your standard iron panel still looks normal. This is called non-anemic iron deficiency, and it is one of the most under-diagnosed causes of fatigue, hair loss, and exercise intolerance particularly in menstruating women, athletes, and vegetarians