There are some instances of hereditary biotin deficiencies, and “these can cause severe medical issues and are typically diagnosed in infancy,” says Castilla. “Certain medications can lead to relative biotin deficiencies as well—most commonly anti-seizure medications.”
Does biotin really help hair and nail growth?
Biotin is essential for hair and nail growth, and that simple fact is likely why it’s become such a buzz-worthy beauty supplement. “But the science isn’t as clear-cut,” says Hernandez. “While it can help in specific cases, like brittle nail syndrome or certain types of alopecia, the evidence for its overall benefits is mixed.”
Most people get an adequate amount of this key vitamin through their diets alone, and for healthy people without a biotin deficiency, “supplements are unlikely to…