High Vitamin B3 (niacin): what it means
A Vitamin B3 (niacin) result above the normal range is considered high. Here is what a raised Vitamin B3 (niacin) can point to, and when it is worth discussing with a doctor.
Reference range: assay-dependent; niacin is rarely measured directly — deficiency (pellagra) is usually a clinical diagnosis, and status can be assessed via urinary niacin metabolites
Understand your full resultWhat a high Vitamin B3 (niacin) can mean
- Supplements or niacin medication — high-dose niacin (used for cholesterol) is the usual reason; it can cause facial flushing, and at high doses affect the liver and blood sugar.
- A high dietary/blood level is otherwise not clinically important — excess is passed in the urine.
When to discuss with a doctor
Niacin is rarely tested directly; a deficiency is usually recognised clinically from the pellagra picture — a symmetrical, sun-exposed rash, diarrhoea and changes in memory or mood — especially in someone with alcohol dependence, malabsorption or a very poor diet. Pellagra responds dramatically and quickly to niacin replacement, so recognising the pattern matters. Because B-vitamin deficiencies cluster, it is usually treated alongside a look at the wider B-vitamin and nutritional picture. Mediora.AI can surface a low niacin, or the associated skin, gut and neurological features, alongside the other B vitamins so the deficiency pattern is visible; confirming pellagra and starting treatment belongs with your doctor, and severe or rapidly progressing symptoms need prompt care.
Conditions this can relate to
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Upload your test - freeMediora.AI is informational - interpretation, not a diagnosis. A single out-of-range value is common and often benign; always discuss decisions with your doctor.