Well, naturally they're going to tell you that. They sell it, and they're in business to do business.
It's not really a bad idea to take both; it won't hurt, and some people do like
Bolt. That said, I think it'll be unanimous that you'd be happier with just
V12 or something similar (
Swole,
Satur8, etc.) if for no other reason because you'll save cash on something that could be spent better elsewhere.
"I don't like people who take drugs...Customs men, for example." - Mitch Miller