A placebo might be given as a stand-alone remedy, or as recent research claims, given as an augmentation to another remedy, adding value to its effect while introducing no extra chemical agent in the process. Just the influence of expectation and will.
The prestigious journal Nature, has published this study – Harnessing the placebo effect to enhance emotion regulation effectiveness and choice
“… There is extensive placebo literature showing how forming positive expectancies can augment the effectiveness of already effective treatments. In that sense, placebo effects are not limited to inert treatments, but also represent a powerful mechanism for boosting outcomes following the administration of active treatments.”