Anybody use Bucked Up for pre-workout?

I have used it for a few days and it really gives you a ton of energy and focus, along with a solid pump. I googled and it seems like the main ingredient (deer antler extract) doesn’t have any negative effects. Has anyone used this for an extended period of time with bad side effects? The only side effect is that I get a strange prickling sensation after I first take it. It’s kind of unsettling, but it goes away after 10-20 minutes when it really kicks in.