Not to defend any unsubstantiated claims, but C60 is not exactly the same as a nanotube. There doesn't seem to be evidence that C60 is toxic/carcinogenic (though not necessarily solid evidence in the other direction either): https://en.wikipedia.org/wiki/Health_impact_of_fullerenes#Bu...
C60 isn't toxic, in fact it is an anti-oxidant, a very strong one. Oxidative stress is sometimes desirable, though, for instance C60 is exceptional at neutralizing Nitric Oxide. You know what is one of NO's functions in the body? Erections.
After cessation, the anti-boner effects seem to disappear, though. Such a shame it even had that effect to begin with because it really made me feel more energetic and happier while allowing me to (consistently and basically within a day or two of starting to take it) do twice the reps during my workouts.
No that's C60 which is 60 carbon atoms in the shape of a geodesic dome. Carbon Nanotubes are completely different, they are long and stringy and get tangled up in cells and break them and can't be removed.