Study	Reason for exclusion
Harding 1989	Harding 1989 assessed the effect of enteral taurine supplementation on visual evoked potentials of preterm infants in a randomised controlled trial. However, the allocation code was not yet broken in the only published report of this trial to date. We have not been able to obtain further data from the trialists.
Wasserhess 1993	Wasserhess 1993 reported a randomised crossover study of taurine supplementation in preterm infants. The intervention period was less than one week.