For what plants? Some do take kindly to some fertilizer - like Neps.

Sarracenia and nepenthes can benefit from a couple pellets of osmocote. Both can benefit from a foliar spray of 1/4 strength urea free orchid fertilizer. Any fertilizer put in the media must be time release and too much will kill the plants.

I would recommend Osmocote, especially, for Neps, since they are likely to be indoors and won't have any other opportunity for food. Sarracenias should be outside and the food will come to them.