Keratin is found in kale, broccoli, onions, leeks and garlic, according to Healthguideinfo.com. LifeCell Skin Fans states that orange colored foods such as mangoes, carrots, sweet potatoes and cantaloupe are high in carotene, which helps the body to produce natural keratin.
Keratin is also found in a variety of meat and dairy products, including liver, fish, yogurt and low-fat milk, according to LifeCell Skin Fans. It is the main constituent in hair, nails, skin and tooth enamel. Having a deficiency in keratin can result in hair loss, sagging skin and nail breakage. Eating keratin rich foods can increase the amount of keratin found within the body and improve an individual's health, according to LifeCell Skin Fans.