We are committed to use most natural ingredients out there. However, even most natural ingredients could still cause allergic reactions. For example, coconut base ingredients are very healthy, skin-loving ingredient but one could always have allergic reaction with the coconut.
Ketoconazole
One of the most common side effect is skin irritation, which can take the form of pimple-like bumps where it's used. In some individuals, it may also cause either oiliness or dryness of the hair or scalp. If any of the side effects occur, stop using and consult your doctor.