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No matter what the cause, iron overload is associated with: Raised serum iron

You should see a dermatologist for hair loss if: If you have persistent hair loss If you feel there is no clear cause of hair loss If you notice other symptoms, like fatigue, weight loss, or fever, in addition to hair loss

Within 48 hours after injection of 100 or 1,000 mcg of vitamin B 12, 50 to 98% of the injected dose may appear in the urine

The absorption of vitamin B12 from your food and oral supplementation requires a well functioning stomach, pancreas, intrinsic factor, enzymes, and the small intestine

Last reviewed: May 30, 2026 Last updated: May 30, 2026 Written by: Jay Hastings, CEO of PlexusDx Jay Hastings is the CEO of PlexusDx, a precision health company focused on genetic testing, blood biomarker insights, and personalized wellness recommendations

If nausea persists, consult your healthcare provider for further evaluation and management