Ever wonder if whey protein is for you? There are many different kinds of protein supplements available, but the most popular is whey protein powder. The 'whey' in whey protein is a cheese by-product. It contains more amino acids than many other protein sources - and amino acids are essential for the growth and repair of muscles. Unfortunately, our bodies cannot produce amino acids on their own, so we have to get it via diet. The most common kind of whey protein powder is called isolate. It’s the most condensed kind and contains the most protein. In fact, it is 90% protein and contains very little cheese or fat. Whey concentrate, on the other hand, is not as refined. Depending on the brand you buy, it could have anywhere from 20% - 89% protein. Whey is a fantastic and affordable protein source. The only real downside is that the lactose can cause some people to bloat and have stomach cramps. However, if you've never had an adverse reaction to lactose in the past, whey protein powder is likely a good choice for you.