Overview
Niacinamide is one of the safest and most broadly useful nutrients available. It is the amide form of vitamin B3 and the precursor to NAD+ and NADH, the molecules that carry electrons through every step of oxidative metabolism. It does about everything protective: it inhibits the enzyme that liberates free fatty acids from storage, suppresses nitric oxide through several routes, blocks the wasteful PARP-driven DNA repair that drains cellular energy, lowers lactic acid, and protects nerve cells against virtually every kind of injury. Ray personally saw it produce dramatic results in diabetes, brain degenerative diseases, heart failure, and cancer. The crucial distinction is that you want the amide form, niacinamide, never the plain nicotinic acid or the so-called no-flush inositol hexanicotinate, both of which release serotonin and histamine and produce inflammation rather than suppress it.
Key Points
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Niacinamide inhibits the lipase that liberates free fatty acids from storage. This is one of its first recognized effects and the reason it works for diabetes and heart failure. By keeping free fatty acids out of circulation, it prevents the polyunsaturated fats (which dominate most people's fat stores) from blocking glucose oxidation, poisoning the pyruvate dehydrogenase enzyme, and feeding the inflammatory prostaglandin cascade. Niacinamide accompanied by orange juice is especially effective at reducing the breakdown of stored fat.
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Niacinamide is one of the safest and most powerful nitric oxide inhibitors available. It blocks nitric oxide through two or three different routes, on par with aspirin and progesterone. Nitric oxide is one of the central pro-inflammatory mediators in the body, poisoning mitochondrial respiration and driving everything from Alzheimer's to baldness to vascular damage.
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Niacinamide is the precursor to NAD+, the master oxidising cofactor in metabolism. Niacinamide converts in the body to nicotinamide adenine dinucleotide, NAD+, which is required at almost every step of glycolysis, the Krebs cycle, and the electron transport chain. For every 12 molecules of ATP produced, roughly 10 depend on NAD+. The rate-limiting enzyme of glucose oxidation, pyruvate dehydrogenase, is directly controlled by the NAD+ to NADH ratio, so raising that ratio with niacinamide accelerates electron flow through the mitochondria and produces more CO2 and water from food.
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Niacinamide deactivates cortisol and converts estradiol to the weaker estrone. NAD+ is the required cofactor that takes active cortisol and converts it to inactive cortisone, and that takes the active estrogen estradiol and reduces it to estrone. Maintaining a high NAD+ to NADH ratio also helps the body synthesise more GABA, more dopamine, more progesterone, and keeps prolactin and estrogen at bay. This is why niacinamide is described as an upstream balancing nutrient rather than a single-target supplement.
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Niacinamide inhibits PARP and prevents the wasteful DNA repair that drains cellular energy. When DNA is damaged, the PARP enzyme builds repetitive base chains to plug the holes, drawing down the NAD pool in the process. If the damage is too extensive, the cell wastes enormous amounts of energy in repair attempts rather than dying cleanly. Niacinamide blocks this enzyme while simultaneously refilling the NAD pool.
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Niacinamide protects nerve cells against almost every kind of injury. It has been shown to reverse changes characteristic of cancer in prostate, breast, pancreas, lung, and melanoma studies, restore heart energy production in heart failure, and protect against DNA injury from radiation. In test tube studies it produces a tremendous increase in human cell longevity, useful for Parkinson's, Alzheimer's, and various cancers. Sometimes 150 to 200 milligrams per day has reversed terminal brain disease.
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Effective doses for most therapeutic uses are 100 to 300 milligrams per day in divided doses. Three or four doses of 125 milligrams each, totaling 200 to 500 milligrams daily, can do dramatic things for nerve degeneration, diabetes, and chronic inflammation. It is probably safe up to 1,000 milligrams per day, and people have taken 1,000 to 1,500 milligrams long-term without problems, though it is best to find the smallest amount that works because manufactured supplements carry trace allergenic impurities.
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Niacinamide must be the amide form, not nicotinic acid or no-flush niacin. Nicotinic acid causes flushing by releasing serotonin, histamine, and toxic prostaglandins, which is damaging rather than therapeutic. The product sold as no-flush niacin is inositol hexanicotinate, which still releases nicotinic acid more slowly and produces the same harmful effects. Niacinamide and the newer nicotinamide riboside are the only forms that produce the protective effects without the inflammatory ones.
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Topical niacinamide has specific uses for skin. A 4 percent niacinamide solution in water has been shown in human studies to reduce scar formation, including from severe acne, and combining 4 percent niacinamide with 1 percent aspirin in solution would likely work even better. Rubbing dissolved niacinamide on age spots daily for a week or two can fade pigments, particularly in sun-induced spots.
Notable Quotes
"Simply supplementing niacinamide is a very direct way to help reverse these epigenetic problems."
[Ray Peat — Aging and Energy Reversal (KMUD)]
"A simple treatment such as niacinamide can restore great amounts of heart energy production and improve the failure."
[Ray Peat — How to Restore and Protect Nerves (KMUD)]
"It's important to get the amide form. The other releases inflammatory mediators and niacinamide is safe up to at least a couple hundred milligrams but I've seen people with brain, terminal brain diseases cure themselves taking 150 or 200 of niacinamide per day."
[Ray Peat — Progesterone vs Estrogen, Listener Questions Part 2 (KMUD)]
"It's a very upstream very high-level balancing nutrient that that really has i don't know of a single negative effect that it has if you take it it reasonable dosages."
[Georgi Dinkov — Generative Energy]
Important Things To Consider
Never use nicotinic acid or no-flush niacin. The flushing reaction from nicotinic acid is not harmless, it is the visible sign of serotonin, histamine, and prostaglandin release, all of which drive inflammation. Only niacinamide and nicotinamide riboside are appropriate.
Single doses larger than 250 to 300 milligrams produce diminishing or negative returns. The synthesising enzyme NAMPT saturates, so a single large dose actually inhibits its own conversion to NAD+. Split the daily total into 50 to 100 milligram increments rather than dosing once.
Niacinamide works as part of a B vitamin team and should be supported by the others. Thiamine (B1), B6, B12, and biotin are all closely involved with the respiratory apparatus and need to be present for niacinamide to do its job. Liver, milk, eggs, meat, and coffee are good food sources of niacinamide and the supporting B vitamins.
Tryptophan can be converted to niacin in the body, but estrogen blocks this. In healthy people with normal protein intake, tryptophan converts to niacin and provides much of the daily supply. In women, particularly those with high estrogen, the tryptophan is redirected into serotonin instead, which is why women historically suffered pellagra more often than men. Vitamin B6 helps push tryptophan toward niacin rather than serotonin.
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