Biotin (Vitamin B7) is particularly important for maintaining your guinea pig's coat, skin, and nails. It acts as a coenzyme for carboxylase enzymes that metabolize fatty acids, amino acids, and glucose. Guinea pig owners often notice biotin's effects most visibly in coat quality — a well-nourished guinea pig has a thick, glossy coat, while biotin-deficient animals develop rough, thinning fur.
Guinea pigs produce biotin through cecal bacterial fermentation, and coprophagy is the main delivery mechanism for this internally produced vitamin. This means that any condition preventing a guinea pig from eating its cecotropes — obesity making it hard to reach them, dental pain, or an Elizabethan collar after surgery — can reduce biotin intake even when the diet is otherwise adequate.
Dietary sources supplement what cecal bacteria provide. Timothy hay, leafy greens, and pellets all contribute small amounts of biotin.
Guinea pigs need approximately 0.2 to 0.4mg of biotin per kilogram of diet, primarily supplied through cecotropes, hay, and fresh greens. Ensure your guinea pig can reach and eat its cecotropes normally.
0.0% of daily nutrient intake
Vitamin B7 (Biotin) makes up 0.0% of your guinea pig's total daily nutritional requirements by weight. That's a tiny amount — but it matters.
Thinning or rough coat, flaky or crusty skin (especially around the face), brittle nails, poor wound healing, and in severe cases alopecia (hair loss). Most often seen when coprophagy is disrupted.
Biotin is water-soluble and excess is excreted without concern. Toxicity from food sources is not possible.
| Life Stage | Size | Min | Max | Unit | Notes |
|---|---|---|---|---|---|
| Adult | — | 0.2 | 0.4 | mg/kg diet | Per kilogram of diet dry matter. Primarily supplied through cecotrope consumption alongside dietary sources. |
Source: NRC 1995, general veterinary consensus
