Author's pick: Muscle Milk

First of all, I would only recommend this product to lean or skinny people trying to bulk up or maintain.  If you're aiming to lose the gut, Muscle Milk and other supplements aren't necessary for you at this point.

Muscle Milk is somewhere between a regular protein powder and a weight gainer.  2 scoops have 350 calories, 160 are which from fat.  This is a product used by bodybuilders and athletes alike, so it has proof of success - but it is only meant for some people.

The product will tell you to use it all the time.  Before working out, before sleeping, after you wake up, etc.  I wouldn't recommend that even if you are trying to bulk up quickly.  If you overdo it, this product will put more fat on you than muscle.  Also, this supplement should be your only source of fat.  No peanut butter or nuts or avocados or anything else.

I would suggest taking this two or three times per day depending on how much weight you need to gain.  Before and after working out is ideal because you will absorb it best at that point.  If your diet is clean, this product is a great supplement, especially since it tastes very good and has very little sugar.  It is the best tasting protein powder I have found yet.  Tastes kind of like chocolate milk or instant breakfast.  I recommend taking it with soy milk or skim milk, but you can also mix it with water.  It comes in several different flavors; I like the cake batter one best myself.

Bottom line: 

Ideal for skinny guys looking to bulk up quickly.  Not great for dieters.