Niacin (vitamin B3) is essential for energy metabolism, converting food into cellular fuel through its role in the coenzymes NAD and NADP, which participate in hundreds of metabolic reactions. It supports healthy skin, digestive tract function, and nervous system health. Dogs can convert some tryptophan (an amino acid found in meat) into niacin, but this conversion is not efficient enough to meet all their needs, making dietary niacin important.
A palm-sized portion of chicken breast (about 100g) provides roughly 12mg of niacin — a medium dog needs approximately 4.25–15mg per day. Chicken, turkey, tuna, and salmon are excellent sources. Commercial dog foods generally provide ample niacin, and deficiency is very rare in dogs fed balanced diets.
0.01% of daily nutrient intake
Vitamin B3 (Niacin) makes up 0.01% of your dog's total daily nutritional requirements by weight. That's a tiny amount — but it matters.
A condition called black tongue (the canine equivalent of pellagra in humans) — characterized by inflammation and ulceration of the mouth and tongue, thick ropy drool, bloody diarrhea, loss of appetite, and if untreated, can be fatal. The tongue turns dark red to black. Though rare with commercial diets, it can occur with corn-heavy diets low in animal protein.
Niacin has a relatively wide safety margin for dogs. Very high supplemental doses can cause skin flushing, itching, liver stress, and gastrointestinal upset, but toxicity from food sources alone is essentially impossible.
| Life Stage | Size | Min | Max | Unit | Notes |
|---|---|---|---|---|---|
| Adult | medium 10-25kg | 4.25 | 15 | mg | NRC recommended allowance. Dogs can convert some tryptophan to niacin but not efficiently enough to meet full needs. |
| Senior | medium 10-25kg | 4.25 | 15 | mg | Senior dogs maintain similar niacin requirements for energy metabolism and skin health. |
Source: NRC 2006
