Synergistic enhancers of antiretrovirals usually do not possess any antiretroviral properties alone, but when they are taken concurrently with antiretroviral drugs they enhance the effect of that drug. [1]
One of these is an over-the-counter nutritional supplement and another two of these have been FDA approved (for other indications). The effects of these drugs, however, will require further evaluation before being clinically exploited.[ citation needed ]