Don't buy TestoFuel because it's a scam and their money back guarantee is ridiculous.
I bought TestoFuel in April, took it religiously and worked out like a mad man. I saw absolutely ZERO results. When I asked for a refund I got a 2 month run around. I was intentionally given bad information by their "customer service" people so that they wouldn't have to give a refund on a technicality. I shipped back the unused portion (about $15 to ship it back using a method that required a signature, their requirement). At the point, for the first time, I was told that I needed to also send the empty bottles of the product that I had used. NO ONE had indicated that I needed to save the empty packaging. Fortunately, I had kept them. I sent them a picture of the empty bottles and the date, but they insisted that I actually send them back. This cost me another $15 and a couple of more weeks.
Ultimately, after exchanging over 20 emails, 2 shipments, over a month of dealing with them, and threatening to dispute the charge with VISA, they gave me a credit but they withheld $35 processing and $15 for THEIR shipping and I spent $30 on my own shipping costs. Basically, I still paid $80 for a pile of garbage.
It is a scam. They offer free product to people who will give them testimonials, so they have few positive ones out there. I do not believe the product works, and I KNOW that TestoFuel just wants your money. Spend your hard earned cash elsewhere.
Bottom Line: No, I would not recommend this to a friend