While protein powders sometimes contain these substances, they simply are not in high enough concentrations to meet your needs. (blog.nkdnutrition.com)
At high enough concentrations, AS - 2 can completely seize up the motor. (sciencemag.org)
We've also found that when these drugs are used in combinations, they don't reach high enough concentrations within the brain tumor to be effective. (sciencedaily.com)