Biotin is found in a wide range of everyday foods, including eggs, organ meats, nuts, seeds, sweet potatoes, and certain vegetables. Most people get enough biotin through a normal varied diet, since the recommended adequate intake for adults is 30 mcg per day.
Top Animal-Based Sources
Organ meats, especially beef liver, are among the richest natural sources of biotin. A 3-ounce serving of cooked beef liver delivers a substantial portion of your daily needs in a single sitting. Eggs are another excellent source, but with an important caveat: they need to be cooked. Raw egg whites contain a protein called avidin that binds tightly to biotin molecules, forming a complex that resists digestion and blocks absorption entirely. Heating eggs to at least 100°C (212°F) breaks down avidin and frees the biotin for your body to use. So a scrambled or hard-boiled egg is a good biotin source, while a raw egg smoothie actually works against you.
Other animal-based foods that contribute meaningful amounts of biotin include salmon, pork chops, and dairy products like cheese and yogurt. These won’t match organ meats gram for gram, but they add up across a full day of eating.
Nuts, Seeds, and Legumes
For plant-based eaters, nuts and seeds are some of the most biotin-dense options available. Sunflower seeds, almonds, and peanuts all provide biotin alongside healthy fats and protein. A quarter-cup serving of roasted almonds or sunflower seeds makes a noticeable contribution toward the 30 mcg daily target. Legumes like soybeans and peanuts round out this category, making trail mix or nut butter a surprisingly effective biotin delivery system.
Vegetables and Starches
Sweet potatoes stand out among vegetables, providing about 2.4 mcg of biotin per half-cup cooked serving. That’s modest compared to liver or eggs, but sweet potatoes are easy to eat in larger quantities and pair well with other biotin-containing foods. Spinach offers about 0.5 mcg per half-cup boiled, and broccoli comes in at 0.4 mcg for the same serving size. These numbers are small on their own, but vegetables contribute to overall intake when combined with richer sources throughout the day.
Mushrooms, bananas, and avocados also contain biotin in varying amounts, making them useful additions to a biotin-conscious diet even though none qualifies as a powerhouse on its own.
Yeast and Fortified Foods
Brewer’s yeast and nutritional yeast are concentrated sources of biotin. Dried brewer’s yeast contains roughly 1.1 mg of biotin per kilogram, which means even a small sprinkle adds up quickly. Nutritional yeast, popular as a cheese substitute in plant-based cooking, offers similar benefits. Many breakfast cereals are also fortified with biotin along with other B vitamins, though the amounts vary by brand, so checking the nutrition label is the most reliable way to know what you’re getting.
Your Gut Makes Some Too
Certain bacteria living in your large intestine can synthesize biotin on their own. However, this internal production is less reliable than it might sound. Research published in mBio found that many common gut bacterial species actually lack the complete pathway needed to produce biotin. Among the Lachnospiraceae family, a major group of beneficial gut bacteria, biotin production capability was frequently absent. So while your microbiome does contribute some biotin, it’s not something you can count on to meet your needs, and the biotin produced in the colon may not be absorbed as efficiently as biotin from food.
How Much You Need
The adequate intake for biotin is 30 mcg per day for adults, with a slightly higher target of 35 mcg during breastfeeding. For context, a single serving of beef liver or a couple of eggs paired with some almonds and a sweet potato easily covers that amount. True biotin deficiency is rare in people eating a varied diet.
The most significant risk factor for deficiency is a genetic condition called biotinidase deficiency, which affects roughly 1 in 60,000 newborns. Children with this condition can’t properly recycle biotin in the body, leading to symptoms like hair loss, skin rashes, seizures, and developmental delays. Newborn screening catches this condition in most countries. Outside of genetic causes, deficiency sometimes appears in people who consume large amounts of raw egg whites over extended periods, or in those with chronic alcohol use or certain digestive conditions that impair nutrient absorption.
A Note on Biotin Supplements and Lab Tests
Because biotin is marketed for hair, skin, and nail health, many over-the-counter supplements contain doses far exceeding the 30 mcg daily recommendation, sometimes reaching 5,000 or 10,000 mcg per capsule. If you take high-dose biotin supplements, be aware that the FDA has issued warnings about biotin interfering with common blood tests. Excess biotin in the bloodstream can cause falsely low troponin readings (the marker used to diagnose heart attacks) and can skew thyroid test results. These errors can go undetected and lead to misdiagnosis. If you’re taking biotin supplements and have upcoming lab work, mention it to whoever is ordering the tests.