There is some research suggesting that Biotin prevents the yeast form of Candida from morphing into its fungal form.
From http://www.mold-help.org/content/view/411/
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"It is extremely important to know that the conversion of the yeast form to the fungal form of Candida is partially dependent upon biotin deficiency. Dr. Yamaguchi and colleagues have recently found that when biotin is added to the medium in high levels, it can prevent the conversion of the yeast form of Candida to its fungal form. They have also found that the fatty acid oleic acid seems to prevent this same conversion."