Biotin plays a role in building the protein that helps regrow healthy hair, which is why it has become such a popular hair and nail supplement. Biotin (aka B7) is one of the many water-soluble B-vitamins that are necessary for your body to function. Its main role in the body is as an important cofactor that’s essential for metabolizing macronutrients. It gets absorbed in the small intestines and stored in the liver. Biotin plays an important role in metabolizing glucose, fatty acids, and amino acids. Its role as an enzyme in the metabolism of amino acids is crucial for protein creation, which results in building strong healthy hair and nails.
While the research is limited, small studies suggest that it can help reduce brittle nails that easily split or crack. The same goes for healthy hair. Studies show that individuals with a biotin deficiency can benefit from supplementing to help with hair growth. Hair is easily damaged by sun-exposure, over washing, and constant heat from the hair dryer or other styling tools.
Symptoms of biotin deficiency typically come on gradually. These include:
- thinning hair and hair loss on all areas of the body
- brittle nails
- a scaly red rash around the eyes, nose, and mouth
In the most severe cases, a deficiency can lead to:
- neurological conditions such as depression
- lethargy
- hallucinations
- tingling of the extremities
Adults need at least 30 mcg per day. If you’re eating a well-balanced diet that includes lean protein and plant-based foods like veggies, nuts, and seeds, you’re likely hitting your base level. There’s no upper limit for biotin because it’s water-soluble, which means your body only stores what it needs. The rest is excreted in your urine.
Additionally, there’s no evidence of high levels of biotin being harmful, which is why you’ll commonly see biotin supplements containing 5,000 to 10,000 mcg. These levels ensure your body gets as much biotin as it needs and absorbs it in the small intestines. Research has shown even
mega-doses of 300 mg (that’s 300,000 mcg) to help with treating multiple sclerosis have no adverse side effects.
If you are avoiding certain biotin-rich foods or are experiencing brittle hair or nails, you may benefit from supplementing! Since biotin is water-soluble, you don’t have to worry about excess. The little extra boost may do wonders for your hair and nails.