How vitamin B3 supports skin blood flow, nerve health, and calmer irritation
Dr. Keith A. Hnilica DVM, MS, MBA, DACVD
6 min read
Niacinamide (nicotinamide) is the amide form of vitamin B3. Unlike nicotinic acid, it does not activate the GPR109A receptor, so it causes no flushing. It feeds directly into the NAD+ salvage pathway, restoring the coenzyme that powers mitochondrial energy production, DNA repair, and sirtuin signaling in keratinocytes, endothelial cells, and peripheral nerves. That distinction matters when reading a supplement label.
Niacinamide is a core component of the tetracycline-niacinamide protocol used in dogs for cutaneous vasculitis, discoid lupus erythematosus, and sterile granulomatous disease. Published case series report satisfactory control in roughly 70 percent of discoid lupus cases. The mechanism appears to be reduced vessel-wall inflammation and restored endothelial NAD+ rather than direct vasodilation, improving perfusion to ischemic, scarring skin.
NAD+ depletion drives axon degeneration through the SARM1 pathway, and maintaining NAD+ preserves small-fiber nerve integrity. Nicotinamide also inhibits antigen-induced histamine release from mast cells and suppresses NF-kB-driven inflammation. Oral nicotinamide reduced transepidermal water loss in a randomized human trial, supporting a calmer, better-sealed barrier.
Published veterinary protocol: 250 mg for dogs under 10 kg, 500 mg for dogs over 10 kg, every eight hours
Clinical response typically appears within one to three months
Vomiting, inappetence, and elevated liver enzymes are the usual dose-limiting effects
Daily maintenance supplements use lower amounts and are not a substitute for prescribed immunomodulatory therapy
Doc Itchy Hair, Skin & Nails Chews were formulated by a board-certified veterinary dermatologist using dosing anchored in veterinary textbooks and peer-reviewed clinical publications, then manufactured in the USA under NASC quality standards. Ingredient amounts are disclosed per chew, so you know exactly what your dog receives and can review it with your veterinarian.
