Vitamin B7, commonly known as biotin, is a water-soluble B-vitamin that plays a crucial role in various physiological processes in the human body. Often referred to as the “beauty vitamin” due to its role in promoting healthy hair, skin, and nails, biotin offers a wide range of health benefits beyond its cosmetic effects. In this comprehensive guide, we will explore the numerous benefits of vitamin B7, its dietary sources, recommended intake, and potential risks associated with deficiency.

The Role of Vitamin B7 in the Body

Vitamin B7, or biotin, serves as a coenzyme for several important enzymes involved in various metabolic processes. Its primary functions include:

Metabolism of Fats, Carbohydrates, and Proteins

Biotin is essential for the metabolism of macronutrients, including fats, carbohydrates, and proteins. It acts as a cofactor for enzymes that break down these nutrients into usable forms for energy production. This role is critical for overall vitality and maintaining a balanced body weight.

Promoting Healthy Skin, Hair, and Nails

Biotin is often associated with improved skin, hair, and nail health. It contributes to the maintenance and formation of keratin, a protein that makes up these structural components. Biotin’s role in keratin production results in healthier hair, smoother skin, and stronger nails.

Cellular Growth and Reproduction

Biotin plays a role in cell growth and division by aiding in the synthesis of DNA and RNA. This function is essential for proper development, repair, and maintenance of cells and tissues.

Support for Pregnancy and Fetal Development

During pregnancy, biotin is vital for the development of the growing fetus. It contributes to the formation of the baby’s skin, hair, and nails. Adequate biotin intake is crucial for expectant mothers to ensure healthy fetal development.

Dietary Sources of Vitamin B7

Vitamin B7 can be obtained from a variety of dietary sources. Here are some foods rich in biotin


Eggs, especially the yolks, are an excellent source of biotin. Consuming eggs is an easy way to increase your biotin intake.

Nuts and Seeds

Almonds, peanuts, sunflower seeds, and walnuts are rich in biotin. A handful of these nuts or seeds can contribute to your daily biotin requirements.

Meat and Poultry

Meat and poultry, such as chicken, turkey, and pork, are good sources of biotin. These animal-based foods provide easily absorbable biotin.


Fish, particularly salmon and sardines, contain significant amounts of biotin. Including fish in your diet can help maintain healthy biotin levels.

Dairy Products

Dairy items like milk, cheese, and yogurt are sources of biotin. These are suitable for individuals who consume dairy products.


Avocado is a nutrient-rich fruit that contains biotin. It also provides healthy fats and a range of other essential vitamins and minerals.

Sweet Potatoes

Sweet potatoes are not only a great source of biotin but also a good dietary choice due to their high fiber and nutrient content.


Leafy greens like spinach contain biotin, in addition to other essential vitamins and minerals. Including spinach in your diet supports overall health.

Fortified Foods

Some processed foods are fortified with biotin, making it easier for individuals to meet their daily biotin needs. These fortified products may include cereals, nutritional bars, and beverages.

Recommended Daily Intake

The recommended daily intake of biotin varies depending on factors such as age, sex, and individual health needs. Here are the general guidelines for adults:

  • Men and Women: The recommended daily intake for adults is typically around 30 micrograms of biotin.
  • Pregnant and Lactating Women: During pregnancy and while breastfeeding, women should aim for approximately 30-35 micrograms per day.

Risk Factors for Vitamin B7 Deficiency

Vitamin B7 deficiency is relatively rare, but certain factors can increase the risk of insufficient biotin levels. Common risk factors include:

Prolonged Antibiotic Use

Long-term use of antibiotics can disrupt the balance of beneficial gut bacteria responsible for producing biotin. This disruption may lead to a deficiency over time.

Overconsumption of Raw Egg Whites

Raw egg whites contain a protein called avidin, which can bind to biotin, making it unavailable for absorption. Consuming excessive amounts of raw egg whites, as seen in some diets, can lead to biotin deficiency.

Gastrointestinal Disorders

Individuals with certain gastrointestinal disorders, such as Crohn’s disease or celiac disease, may have impaired biotin absorption.

Genetic Disorders

Rare genetic disorders, such as biotinidase deficiency, impair the body’s ability to recycle biotin. These conditions may require lifelong biotin supplementation.

Potential Risks of Vitamin B7 Deficiency

While biotin deficiency is uncommon, its symptoms and risks are important to recognize. Common issues associated with biotin deficiency include:

Hair Loss

One of the most recognizable signs of biotin deficiency is hair loss, which can manifest as thinning hair or patches of hair loss.

Brittle Nails

Biotin deficiency can result in brittle and easily breakable nails.

Skin Issues

Skin problems such as rashes, dryness, and dermatitis are associated with biotin deficiency. Skin may become flaky and itchy.

Neurological Symptoms

Some individuals with severe biotin deficiency may experience neurological symptoms, including numbness and tingling in the extremities, and muscle weakness.


In rare cases, biotin deficiency can lead to conjunctivitis, an inflammation of the eye’s outer membrane.

Balancing Vitamin B7 Intake

To ensure you receive the full benefits of vitamin B7 and prevent potential risks of deficiency, consider the following strategies:

Consume a Varied Diet

Including a variety of biotin-rich foods in your diet is an effective way to meet your daily requirements. A diverse diet ensures you receive a range of essential nutrients.

Avoid Excessive Raw Egg White Consumption

While eggs are a good source of biotin, avoid consuming large quantities of raw egg whites, as they contain avidin, which can interfere with biotin absorption.

Manage Gastrointestinal Disorders

If you have a gastrointestinal disorder that may affect biotin absorption, work with your healthcare provider to develop a management plan that addresses your specific needs.

Consider Supplements

In cases of biotin deficiency, your healthcare provider may recommend biotin supplements to correct the deficiency and alleviate related symptoms.

Maintain a Balanced Lifestyle

A well-rounded lifestyle that includes a balanced diet, regular

exercise, and stress management is essential for overall health and well-being. Such a lifestyle can contribute to maintaining healthy skin, hair, nails, and overall vitality.

Monitor Your Health

Regular medical check-ups are important for identifying early signs of biotin deficiency or related symptoms. If you notice hair loss, skin issues, or brittle nails, consult a healthcare professional for a thorough evaluation.

Understand Dietary Preferences

Vegetarians and vegans should be aware of their dietary choices and ensure they obtain biotin from plant-based sources or supplements if needed.

Be Mindful of Medications

Certain medications, such as long-term antibiotic use, can affect biotin levels. If you are prescribed such medications, discuss potential biotin supplementation or dietary adjustments with your healthcare provider.


Vitamin B7, also known as biotin, is a versatile and essential nutrient that offers numerous benefits for overall health. Its role in promoting healthy skin, hair, and nails is just one aspect of its importance. Biotin also plays a critical role in macronutrient metabolism, cellular growth and reproduction, and supports pregnancy and fetal development.

Kristina Shafarenko
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BSc Psychology, The University of Manchester

Kristina Shafarenko is a relationship and health and wellness psychologist and a part-time freelance lifestyle writer covering health and fitness, sex, sexual wellness, and relationships. When she’s not writing, you can find her planning her next getaway, taste-testing every coffee spot in sight, and lounging at home with her cat, Buddy.