[A 13-week subchronic oral toxicity study of chlorophyll in F344 rats].

A 13-week subchronic toxicity study of chlorophyll (containing 40% oil) was performed in both sexes of F344 rats by feeding of CRF-1 powder diet containing 0, 0.18%, 0.55%, 1.66% and 5%, and vehicle (oil) alone. No animals died during the administration period and no changes in body weights and food intakes were found in any dosed groups. Some hematological, serum biochemical and histopathological changes were observed for the 5%-treated group, but these did not suggest obvious toxicity. These findings indicate that the treatment with 1.66% chlorophyll in diet for 13 weeks does not cause any changes in rats and the 5% feeding is not obviously toxic.