Niacin (Nicotinic Acid/NAD+ Precursor)

Niacin, also known as nicotinic acid or vitamin B3, is a well-established B-vitamin that has gained renewed attention in longevity research as a precursor to NAD+ (nicotinamide adenine dinucleotide). Studies suggest that niacin supplementation may help maintain cellular NAD+ levels, which naturally decline with age and are crucial for mitochondrial function, DNA repair, and the activation of sirtuins–proteins associated with longevity pathways. Research indicates that adequate niacin intake supports cellular energy metabolism and may contribute to healthy aging processes.

Clinical trials have demonstrated niacin's cardiovascular benefits, including improvements in lipid profiles and potential protective effects against metabolic dysfunction. Recent research suggests that niacin may help address age-related NAD+ deficiency, potentially supporting mitochondrial health and cellular resilience. However, the characteristic "niacin flush"–a temporary reddening and warming of the skin–remains a common side effect, though extended-release formulations may reduce this response. While promising for longevity applications, most human studies have focused on cardiovascular outcomes rather than direct anti-aging effects.

As interest in NAD+ biology grows, niacin represents one of the most accessible and well-studied approaches to supporting cellular NAD+ levels. Research indicates it may offer a cost-effective way to support the body's NAD+ synthesis pathways, though individual responses vary significantly. The supplement is generally well-tolerated at moderate doses, making it an attractive option for those interested in longevity-focused interventions, particularly when combined with other healthy aging strategies.