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2. Lifestyle Causes

Smoking is one lifestyle choice that can lead to biotin deficiency. One study shows that women who smoke are more likely to experience biotin catabolism. This breakdown of vitamin B7 results in biotin depletion and increased production of byproducts excreted in urine. Excessive alcohol intake can also reduce biotin levels in the blood, and tests suggest liquor inhibits biotin absorption in the small and large intestines.

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