> the dosage known to be effective is higher than the dosage known to be safe. This is misleading a little. Only the high dose was tested in cell cultures.

> the dosage known to be effective is higher than the dosage known to be safe. This is misleading a little. Only the high dose was tested in cell cultures. That does not mean that low doses are not also very effective. In the lab, they usually use very high doses to confirm that there is any effect at all. A second set of experiments (not done yet) then calibrate to discover the minimum effective dose.