To date, there are no reported incidents of serious, negative side effects. It would be perfectly safe to add 8-10 drops to as little as 8 to 10 ounces. You would need to drink more than 300 bottles of Biofullerene over a very short period of time before you would come close to levels of toxicity.
People with hyper sensitivity to caffeine and blood pressure problems have reported feeling dizzy after taking Biofullerene. If you experience dizziness, it may be that your body is sensitive to fullerenol. We recommend decreasing the dose to a 1/4 of the full dose, diluting in a larger volume of water 34-68 OZ and analyzing your reaction. If the effects disappear, gradually increase the dose to the full amount over a period of 2 weeks. If the effects persist, stop taking Biofullerene.