o answer this you should first understand what normalization does.
Normalize will analyse the tracks amplitude and either bring the volume up or down until the loudest peak is at 0dB.
This may not be desirable if you have mastered the track to have peak at -0.3dB which is a common practice.
Another thing to take in to account is that normalizing increases the overall volume, which includes raising the noise floor, so if your track is very quiet you should look at increasing the loudness in the mixing and mastering phase.