Why does nicotinic acid help autoimmune conditions?
Nobody fully knows. This site collects and organizes the evidence.
0 curated studies · 11 pathway syntheses · queryable knowledge graph
Mechanistic threads
Nicotinic Acid and the GPR109A Receptor
hypothesis40How nicotinic acid activates GPR109A to promote regulatory T cells and suppress inflammation.
NAD+ Deficiency as a Driver of Autoimmune Disease
hypothesis41NAD+ as master regulator: how depletion through the Preiss-Handler pathway connects to immune dysfunction.
Butyrate, GPR109A, and the Gut-Immune Circuit
hypothesis15How dysbiosis reduces butyrate, impairs GPR109A signaling, and how niacin bypasses the broken microbiome.
Why Nicotinic Acid Helps Autoimmune Conditions
hypothesis10Connecting the threads: GPR109A + NAD+ → specific autoimmune conditions.
The Subclinical Pellagra Hypothesis
speculative18Pellagra's 4 Ds map to the exact conditions in these studies. The RDA prevents overt pellagra, not optimal function.
Form, dose, and practice
Nicotinic Acid vs. Niacinamide vs. NR vs. NMN: Why Form Matters
established11Only nicotinic acid activates GPR109A. The form determines the mechanism.
Vitamin or Drug? The Dose-Response Problem
data33RDA is 14-18mg. Therapeutic range is 100-1000x that. The pharmacological implications.
The Niacin Flush: Signal, Not Side Effect
hypothesis7PGD2-mediated, GPR109A-dependent. Flush intensity correlates with inflammatory state.
Sourcing and trust
Not All Nicotinic Acid Is Created Equal
data0Manufacturing methods, pharmaceutical grading, and COA interpretation for gram-scale use.
What the Evidence Doesn't Show
data1Hepatotoxicity, AIM-HIGH, negative studies. Including them makes the positive evidence credible.
Why Your Doctor Doesn't Know About This
established2Off-patent economics, the flush barrier, cholesterol framing, and the AIM-HIGH chilling effect.
Frequently asked questions
What is nicotinic acid (niacin)?
Nicotinic acid, commonly called niacin, is a form of vitamin B3. Unlike niacinamide (nicotinamide), nicotinic acid causes a characteristic skin flush and has distinct therapeutic effects on lipid metabolism and immune modulation.
How does niacin help with autoimmune conditions?
The mechanism is not fully understood, but research points to several pathways: GPR109A receptor activation (an anti-inflammatory receptor on immune cells), NAD+ biosynthesis (restoring cellular energy balance), and gut-immune axis modulation. This site aggregates the evidence across all known pathways.
What is the difference between niacin and niacinamide?
Niacin (nicotinic acid) and niacinamide (nicotinamide) are both forms of vitamin B3, but they have different effects. Niacin activates the GPR109A receptor and causes flushing; niacinamide does not. Research on autoimmune conditions generally focuses on nicotinic acid specifically.
What doses of niacin are used in research?
Therapeutic research on niacin for autoimmune and lipid conditions often uses doses ranging from 1g to 3g per day of nicotinic acid, well above the RDA of 16mg. The Hoffer protocols for orthomolecular medicine used high-dose niacin (1–3g/day) over decades.
Is this site medical advice?
No. Niacin.io is a research aggregator. It organizes published studies and synthesizes evidence pathways. It is not a substitute for medical advice. Always consult a qualified healthcare provider before changing your supplement or medication regimen.