It can be used for staining the Golgi apparatus in cells and Nissl granules in neurons.

[2] The Neutral Red Cytotoxicity Assay was first developed by Ellen Borenfreund in 1984.

As cells begin to die, their ability to incorporate neutral red diminishes.

[3] The neutral red is also used to stain cell cultures for plate titration of viruses.

Neutral red is added to some growth media for bacterial and cell cultures.