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The two most common forms of niacin in food and supplements are nicotinic acid and nicotinamide. The body can also convert tryptophan—an amino acid—to nicotinamide. Helps prevent health problems and promote a healthy skin, cardiovascular system, gastrointestinal system, and cell growth. It helps your dog's body produce energy from food. Found in grass-fed liver, free-range chicken, grass-fed beef, salmon, and sardines.