I recommend the bars listed in the "Frozen" section, which are the most popular.
I have found that if you are in the market for a protein bar, look for ones that are made with whey. Whey is naturally protein rich and is one of the strongest forms of protein. In fact, it has over 500 amino acids (that's not all, there are around 4,500 in the body) that have been synthesized by your body. You should be able to find these amino acids in the following products: Whey Protein Isolate, Whey Powder, Whey Milk, and Whey Protein Concentrate. A note about nutritional value. When you are buying protein bars for the first time, it is important to look at the nutritional value (in addition to the calorie value) as these can make or break whether you are buying a quality product. Most of the protein bars on the market are labeled as low fat, and while this is great for those who have a sweet tooth, it can also be harmful to your health. The best protein bars are those that have been fortified with essential amino acids, which is a term that means the amino acids have been created and formed by the body from protein consumed in nature.