Biotin is found in various foods, including liver, cauliflower, salmon, carrots, bananas, soy flour, cereals, and yeast.Biotin content of food is reduced by cooking and preserving.f you think that you are not getting enough vitamins and/or minerals in your diet, you may choose to take a dietary supplement. Biotin is found in various foods, including liver, cauliflower, salmon, carrots, bananas, soy flour, cereals, and yeast. Biotin content of food is reduced by cooking and preserving.