No-observed-adverse-effect Level
A 13-week study by H. Nakamura and colleagues at the National Institute of Health Sciences (Japan) of tocotrienols' toxicity in rats found significant changes in several blood components, increases in liver weights and (in females) reductions in ovary and uterus weights, depending on the dosages. The authors estimated the no-observed-adverse-effect level (NOAEL) to be 120 mg per kg of body weight per day for males and 130 mg per kg of body weight per day for females. Since effects on the blood components were observed in all cases with non-placebos, a no-observed-effect level (NOEL) could not be determined.
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