Bravo Star Greg Plitt -- Company Warns ... Drink Won't Make You Superman

Bravo star Greg Plitt's favorite energy drink will not give you superpowers ... so says the company that makes WheyUP -- the product Plitt was plugging when he was hit by a train.

The pre-workout drink contains protein and caffeine, but Shadow Beverages and Snacks wants to stress what should be obvious -- it would never give anyone the ability to outrun a train.

Even though a bunch of empty WheyUp bottles were found near the tracks ... a company rep tells us Plitt wasn't drinking all of them -- he was crushing most of them with a hammer for the promo shoot.

Plitt was a co-owner of WheyUp, and the rep says he had full creative control when it came to his video shoots.