What does a high Selen result mean?

A high selenium level in blood or urine typically indicates excessive intake, which can lead to selenosis – a toxic condition. Symptoms include garlic breath, fatigue, hair loss, brittle nails, and in severe cases neurological damage. The tolerable upper intake level is about 400 µg/day for adults; levels above this warrant medical evaluation. Common causes are over-supplementation or high-selenium foods (e.g., Brazil nuts). The provided context does not directly address selenium, so this answer relies on established medical knowledge. Consumer DNA tests cannot measure selenium; this is a clinical lab parameter. Evidence for selenium toxicity is strong (human studies), but individual results should be interpreted with a healthcare provider. Repeat testing and dietary review are recommended before any intervention.