Ok sorry dude, wasn't having a go, it's just newbies and people considering treating their hairloss read this site, and I know from experience that stories or even questions like this, can scare people and put them off using a product that can really help them (and there isn't enough that can help to ingnore one of the best ones because of a unfounded scare).
But anyway, there's never been a mention of that on any hairloss site as far as I know, which contain people a lot more knowledgeable than your friend and googling yielded no results. Chest pains, well anything's possible, but never seen anyone complain of this., search for it.