Viagra to NFL Players -- Boner Pills WON'T Give You an Edge on the Field

The people behind Viagra want NFL players to know ... the magical penis pills should NOT be used to enhance performance on the field ... despite what Brandon Marshall may have heard.

Marshall -- one of the best wide receivers in the league -- gave an interview today and discussed the lengths some of his peers will go to get on edge on the field, saying:

"I’ve heard of some crazy stories. I’ve heard (of) guys using like Viagra, seriously. Because the blood is supposedly thin, some crazy stuff. So, you know, it’s kind of scary with some of these chemicals that are in some of these things so you have to be careful."

Shockingly, a rep for Pfizer -- the company behind Viagra -- tells TMZ the pills are "indicated solely for the treatment of erectile dysfunction (ED)."

The company explained, "Pfizer has not examined the safety of Viagra in men without ED and does not promote or encourage the use of Viagra for any use but the treatment of ED."