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A 90-day Feeding Toxicity Study of l-Serine in Male and Female Fischer 344 Rats. 2010

Yukie Tada, and Norio Yano, and Hiroshi Takahashi, and Katsuhiro Yuzawa, and Hiroshi Ando, and Yoshikazu Kubo, and Akemichi Nagasawa, and Keigi Chin, and Yasuko Kawamata, and Ryosei Sakai, and Norio Ohashi, and Akio Ogata, and Dai Nakae

A subchronic feeding study of l-serine (l-Ser) was conducted with groups of 10 male and 10 female Fischer 344 rats fed a powder diet containing 0, 0.06, 0.5, 1.5 or 5.0% concentrations of l-Ser for 90 days. There were no toxicologically significant, treatment-related changes with regards to body weight, food intake, water intake or urinalysis data. In several of the hematology, serum biochemistry and organ weight parameters, significant changes were observed between some of the treated groups and the controls. All these changes, however, were subtle and lacked any corresponding pathological findings. In addition, the increased or decreased values remained within the range of the historical control values. In fact, histopathological assessment revealed only sporadic and/or spontaneous lesions. In conclusion, the no-observed-adverse-effect-level (NOAEL) for l-Ser was, therefore, determined to be at least a dietary dose of 5.0% (2765.0 mg/kg body weight/day for males and 2905.1 mg/kg body weight/day for females) under the present experimental conditions.

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