C60 is non-toxic

In this study, rats were given 1 gram of C60 per kilogram of body weight and no toxicity was found. Sub-acute oral toxicity study with fullerene C60 in rats

• Study strengths: This study was done in vivo, in living mice. The amount of C60 administered to the test rats in this study was approximately 10,000 times the amount used in previous studies that found C60 to be beneficial. Even at this extreme amount, C60 was found to have no toxicity.
• Study weakness: This study was done on test animals, not humans.