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External and iatrogenic causes: Excessive supplementation: High-dose oral supplements or frequent intramuscular injections (hydroxocobalamin or cyanocobalamin) can elevate serum levels, though this rarely causes problems

The FDA added it to injectable semaglutide in January 2025, and it climbs the dose axis like everything else. Burning or tingling skin tracks the dose, not the weight lost, and an active-comparator study put the risk about twice that of another weight-loss drug. The mechanism is unsettled: the tempting "it is the drugs signaling arm" story is ruled out, because the strongest GLP-1 signaler in the class carries no such signal

it is the statistical sound of nothing happening

Polarization dictates iron handling by inflammatory and alternatively activated macrophages