Riboflavin is a key component of two coenzymes (FAD and FMN) that participate in dozens of metabolic reactions, particularly those involved in energy production from fats, proteins, and carbohydrates. It supports healthy skin, coat, and mucous membranes, contributes to red blood cell production, and helps maintain eye health. Cats obtain riboflavin from meat, eggs, and dairy — all staples of a carnivorous diet. Riboflavin is sensitive to light, which is why pet food should be stored in opaque containers.
A single egg provides roughly 0.2–0.25mg of riboflavin — your adult cat needs approximately 0.2–0.8mg per day, easily met by commercial cat food or a diet including regular servings of meat and eggs.
0.0% of daily nutrient intake
Vitamin B2 (Riboflavin) makes up 0.0% of your cat's total daily nutritional requirements by weight. That's a tiny amount — but it matters.
Stunted growth in kittens, skin lesions around the face and mouth, cataracts or cloudy eyes, muscular weakness, and fatty liver changes. Severe deficiency can cause collapse and death, though this is rare with modern commercial diets.
Riboflavin is water-soluble and excess is excreted in urine, giving it a characteristic bright yellow color. Toxicity from dietary sources is not a practical concern.
| Life Stage | Size | Min | Max | Unit | Notes |
|---|---|---|---|---|---|
| Adult | — | 0.2 | 0.8 | mg | Riboflavin supports energy metabolism, healthy skin, and eye function. Meat and eggs are excellent sources for cats. |
| Juvenile | — | 0.2 | 1 | mg | Growing kittens need riboflavin for energy production during rapid growth. Deficiency can cause cataracts and stunted growth. |
Source: NRC 2006, AAFCO 2024
