Mechanism of Action
Biotin's role in coat and skin health operates through acetyl-CoA carboxylase, the rate-limiting enzyme in de novo fatty acid synthesis. Without adequate biotin, this enzyme cannot function, reducing the availability of the long-chain fatty acids that are incorporated into keratin structures and the skin lipid barrier. The result in deficient animals is a brittle coat, flaky skin and weak or brittle nails. Supplemental biotin corrects deficiency and supports normal fatty acid synthesis. In animals receiving adequate dietary biotin, supplementation produces modest additional benefit. The animals most likely to respond visibly are those with poor coat quality or brittle nails suggesting underlying insufficiency.
Evidence Summary
Biotin's essential role in fatty acid synthesis is established biochemistry. The most directly applicable veterinary research comes from equine medicine, where Frigg et al (1989, Veterinary Record) demonstrated significant improvement in hoof quality and horn structure with supplemental biotin in horses with poor hoof condition. In dogs and cats the evidence is less extensive but biotin deficiency produces dermatological changes that resolve with supplementation, confirming the role. At supplemental doses in animals with adequate status the benefit may be modest but the intervention is safe and inexpensive.
In Petz Park Products
Skin and Coat for Dogs: Biotin 20mcg per scoop. Skin and Coat for Cats: Biotin 5mcg per scoop.
Safety and Considerations
Biotin is safe at any supplemental dose. It is water-soluble and any excess is excreted in urine. No toxicity has been documented. No drug interactions are established at supplemental doses. It is one of the safest vitamins in use.