Short answer: Niacin (Vitamin B3) is an essential B vitamin required for NAD production, which drives cellular energy metabolism — a genuinely distinct mechanism from the formula's nitric oxide ingredients.
Why Niacin's role is separate from the formula's core nitric oxide idea
Niacin plays a role in cellular energy metabolism through NAD — a different, complementary contribution rather than another nitric oxide precursor.
Why this ingredient carries its own specific, disclosed side effect
Niacin can cause flushing — warmth, redness or tingling across the face, arms and chest — which is harmless but can be uncomfortable, a direct, honest disclosure worth expecting.
💡 Worth knowing: details at the NIH ODS niacin fact sheet — a genuine, independent, non-commercial source cited directly.