The role of biotin in the field of health.

You may recognize vitamin B7 by its popular name biotin. It is a water-soluble B vitamin found naturally in some foods and also in supplements. Biotin plays a vital role in assisting enzymes to break down fats, carbohydrates, and proteins in food. It also helps to regulate signals sent by cells and the activity of genes.

An RDA (Recommended Dietary Allowance) does not exist for biotin because there is not enough evidence to suggest a daily amount needed by most healthy people. Instead, there is an AI (Adequate Intake) level, which is assumed to ensure nutritional adequacy.

Vitamin B7 and Health:

Biotin supplements are often glamorized as a treatment for hair loss and to promote healthy hair, skin, and nails. Although a deficiency of biotin can undoubtedly lead to hair loss and skin or nail problems, evidence showing the benefit of supplementation is inconclusive. A handful of case reports and small trials have shown a benefit, but the study designs had weaknesses:

The diagnoses of the type of hair conditions varied or were not cited at all. Researchers have also noted that certain hair loss conditions like alopecia can resolve spontaneously without treatment, so it is not clear that biotin supplements specifically caused the regrowth.

The studies did not measure the participants’ baseline blood levels of biotin to see if they were normal or deficient. Some research suggests that biotin supplements may benefit people who have a deficiency of the nutrient.

Between 1999 and 2016, the proportion of supplement users increased by nearly thirtyfold. In November 2017, the U.S. Food and Drug Administration (FDA) issued a warning based on reports of biotin supplements interfering with laboratory blood tests, causing incorrect results. High doses have produced either falsely elevated or decreased blood levels, depending on the test. This has affected lab results of certain hormones, such as thyroid-stimulating hormone and vitamin D, as well as a biomarker for heart attacks called troponin. Case reports of this occurrence showed people taking biotin amounts much higher than the AI level (30 micrograms daily or 0.03 mg) but in doses commonly found in supplements (10-300 mg). Biotin is often added to multivitamins and hair/nail/skin supplements. The FDA recommends that people inform their doctors at each visit of all supplements and doses they are taking.

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