I’ve read that taking some Niacin before a contest can help bring out vascularity because of the heating effect it has on the body. I tried some out the other day using an Everlast product called Energy. My skin started to crawl similar to that slight tingle felt when taking Beta Alanine, but with wayyyyy more intensity. It felt itchy and as if there was a tonne of blood being flushed to that area. My face felt totally numb. I don’t know if it increased my vascularity, but if I bore an amazing resemblance to a tomato for about half an hour.