Preliminary Data on the Safety of Phytoene- and Phytofluene-Rich Products for Human Use including Topical Application

Table 1

Classification of cytotoxicity results in the NRR method.

IC50 (%)	% cell death at the 50% dilution	Classification
>50	<20	Negligible cytotoxicity
	>20	Low cytotoxicity
>25 and <50		Moderate cytotoxicity
<25		High cytotoxicity