The Role of Biotin in Hair Growth

Natural sources of biotin (vitamin B7) . Foods as Avocado, eggs, soybeans, cauliflower, carrot, sweet potato, mushrooms, peanuts, walnuts, sunflower seeds and almonds on wooden table.

Biotin, also known as Vitamin B7 or Vitamin H (derived from the German words “Hair und Haut,” meaning “Hair and skin”), plays a crucial role in our bodies. Let’s delve into the fascinating world of biotin and its impact on hair and nail health.

What Does Biotin Do?

Biotin is a water-soluble vitamin that participates in various metabolic processes. One of its primary functions is to convert the food we consume into energy. It aids in breaking down carbohydrates, proteins, and fats, ensuring our bodies have the necessary fuel.

Daily Biotin Requirement

According to the Food and Nutrition Board of the Institute of Medicine, a daily intake of 40 mcg/day is sufficient for maintaining good health. Fortunately, biotin deficiency is rare among individuals with a balanced diet.

Sources of Biotin

You can obtain biotin from various sources:

  1. Food: Include foods like egg yolks, liver, cereals (such as wheat and oats), spinach, mushrooms, sweet potatoes, almonds, and rice in your diet.
  2. Gut Bacteria: While humans cannot synthesize biotin on their own, the microorganisms in our intestines produce biotin for us.
  3. Dairy Items and Breast Milk: These also contain biotin.

Factors Affecting Biotin Levels

Several factors can impact biotin levels:

  1. Genetics: Some babies are born without the ability to produce biotin due to a lack of the biotinidase enzyme.
  2. Gastrointestinal Disorders: Conditions like inflammatory bowel syndrome may impair nutrient absorption in the gut.
  3. Medications: Long-term use of broad-spectrum antibiotics, epilepsy drugs (carbamazepine, phenytoin, and phenobarbital), and isotretinoin (used for acne) can affect biotin absorption.
  4. Pregnancy, Lactation, Smoking, and Alcohol Use: These factors can increase biotin metabolism, potentially leading to deficiency.

Biotin and Hair Growth: Separating Fact from Fiction

  • Widely Believed: Biotin is often touted as a miracle solution for hair and nail growth. However, there is no conclusive evidence to support this claim.
  • Nutrient Deficiencies: Hair loss is more likely due to deficiencies in other nutrients, such as iron, folic acid, vitamin D, and vitamin B12, rather than biotin alone.
  • Excessive Intake: While excessive biotin intake is not toxic and is excreted in urine, high levels in the bloodstream can affect laboratory tests, leading to falsely elevated results for thyroid, vitamin D, and DHEAS levels.

In summary, while biotin is essential for overall health, it’s not a magical solution for hair growth. 


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