Biotin (vitamin B7) is a coenzyme essential for several carboxylase enzymes involved in fat metabolism, amino acid processing, and gluconeogenesis (the production of glucose from non-carbohydrate sources). For wild birds, biotin's role in keratin production makes it especially relevant during feather growth and molt. Keratin — the structural protein of feathers, beaks, claws, and leg scales — requires biotin-dependent enzymes during synthesis, and biotin deficiency in poultry is classically associated with poor feather development and dermatitis on the feet.
Biotin is widely distributed in natural foods: seeds, nuts, insects, and eggs all contain it. The gut bacteria of birds also produce some biotin, though the extent to which this microbially produced biotin is absorbed varies. One interesting nutritional interaction involves avidin, a protein found in raw egg whites that binds biotin and prevents its absorption. This is relevant in poultry science but not particularly relevant to wild birds, which rarely encounter raw egg whites in their natural diet.
For the birds at your feeder, biotin is adequately supplied by the diverse mix of seeds, nuts, and insects they consume. Peanuts and sunflower seeds both contain meaningful biotin levels. No special supplementation is needed, and biotin deficiency in free-ranging wild birds is extremely uncommon.
A varied feeder offering with sunflower seeds, peanuts, and mealworms provides adequate biotin alongside many other B vitamins. Biotin is one of those nutrients that the diverse natural diet of wild birds handles well without feeder intervention. Focus your feeding efforts on the high-impact nutrients — protein, fat, calcium, and water — and biotin will take care of itself.
Poor feather development during molt, dermatitis on the feet and legs (scaly, rough skin), brittle claws, and reduced hatchability in eggs. Biotin deficiency is very rare in wild birds with diverse diets. The most likely scenario would be birds consuming large amounts of raw egg white (from raiding other birds' nests), which is an uncommon dietary pattern.
Biotin excess from natural food sources is not a concern. The vitamin is water-soluble and excess is efficiently excreted. No toxicity from dietary biotin has been documented in any bird species.
| Life Stage | Size | Min | Max | Unit | Notes |
|---|---|---|---|---|---|
| Adult | — | — | — | mg/kg diet | No established requirement for wild feeder birds. Widely distributed in seeds, nuts, and insects. Gut bacteria also produce biotin. No supplementation needed. |
Source: general avian veterinary consensus
