Hey Mike...P-13 is a Progesterone based ph, and is the same as Revolt (kilosports). It can cause a lbido boost.
With any ph/ds there is a chance of libido loss. Running formestane while on cycle can help to boost libido, as well as many other benifits. We have an awesome topical formestane called
TransForm
What are some of your goals besides keeping your libido up. That would give a better idea of what to recommend, as libido can be managed on-cycle through supplementation.