I dont use any pills to increase the blood flow.
Used to use Ginkgo Biloba and Korean Ginseng when I used to do Penis Enlargement reguler, so maybe that helped the gains? Hard to say, so many factors play a role.
I do take Omega 3 and 6 oils as part of my medication, and they do help the vessells and the blood flow...so who knows again? did it help?
I dont take viagra or silagra etc etc but I bet it would help in girth sessions ten-fold.
Hope this helps you mate.