Niacin, or Vitamin B3, is one of the more established ingredients in brain and energy supplements — not because it's trendy, but because its role in cellular energy production is well documented independent of any supplement brand.
Niacin is a precursor to NAD+ (nicotinamide adenine dinucleotide), a molecule central to how cells generate usable energy inside their mitochondria. Neurons are especially energy-demanding cells, which is why Niacin shows up specifically in brain-focused formulas rather than only general multivitamins. The NIH Office of Dietary Supplements maintains a factsheet on Niacin covering its established roles and recommended intake.
Niacin is also associated with general microcirculation support — the small-vessel blood flow that complements the larger-vessel effects of nitric oxide precursors like Arginine and Citrulline.
Higher doses of Niacin (particularly the "flush" form) can cause a temporary skin flushing sensation in some people — worth knowing before starting, and worth checking which form (and roughly what amount) a supplement uses.
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