Niacin Supplements

Niacin helps the body make NAD and NADP, molecules used in many cellular reactions. Food, fortified products and the conversion of tryptophan contribute to niacin supply. Correcting a nutritional deficiency is different from adding a large dose to change cholesterol or pursue a longevity claim.^{See reference 1}

The trials below studied people with established cardiovascular disease who were already receiving statin-based treatment. They asked whether adding a particular niacin preparation improved clinical outcomes. They were not trials of meeting ordinary vitamin needs, treating deficiency or supplementing healthy people. The amounts are study descriptions, not instructions.^{See reference 2,See reference 3}

The HPS2-THRIVE preparation contained another medicine, laropiprant. Its harms should not all be assigned to niacin alone. AIM-HIGH tested a different regimen and also found no additional clinical benefit. Together, the trials show why a favourable change in a blood marker cannot substitute for measuring actual health outcomes.^{See reference 2,See reference 3}

They do not prove that niacin has no medical use in any situation. They do show why adding it to an existing treatment simply to raise HDL is not justified by the HDL change alone. If you already take prescribed niacin, discuss the evidence with the prescriber rather than stopping or substituting it yourself.^{See reference 4}

Nicotinic acid can cause warmth, redness and itching. High supplemental or medicinal exposure can also affect liver function, glucose regulation and blood pressure. Lack of flushing does not prove safety, and high-dose nicotinamide has its own adverse effects.^{See reference 1}

NHLBI also highlights higher blood glucose and uric acid, which can matter for diabetes or gout. Bring the exact product and a list of medicines to a pharmacist or prescriber. Release formulation and concurrent treatments affect the safety discussion.^{See reference 4}