3-hydroxyisovaleric acid is a 3-hydroxy monocarboxylic acid that is isovaleric acid substituted at position 3 by a hydroxy group. Used as indicator of biotin deficiency. It has a role as a human metabolite. It derives from a butyric acid and an isovaleric acid. It is a conjugate acid of a 3-hydroxyisovalerate.
Experimental spectrum in Natural Products Magnetic Resonance Database: [NP0001323](https://np-mrd.org/natural_products/244/submission_spectrum_view?spectrum_id=106&spectrum_type=real)