||05-22-2013 11:01 AM
Here's some info I found on the two whey proteins.
Protein concentrates. Protein concentrates are created by pushing the protein source (milk, whey, etc.) through a very small filter that allows water, minerals, and other organic materials to pass though. The proteins, which are too big to pass through the filter, are collected, resulting in protein powder. When this process is used to make whey protein concentrate, it yields a protein powder that is 70-85% protein and up to 5% lactose. People with lactose intolerance will have trouble consuming large amounts of whey protein concentrate.
Protein isolates. This is the next step up in purification; the protein is purified again using more filtration or a technique called ion-exchange or cross-flow microfiltration. Protein isolates have very low levels of carbohydrates and fat and are almost exclusively pure protein. People with lactose intolerance usually donít have trouble with whey protein isolates. Many companies that make whey protein isolates certify that their product is lactose free or they will even add lactase which is an enzyme that breaks down lactose to the protein powder to help with digestion.
If you are lactose intolerant and you have problems with gas then the whey protein isolate is the better choice. But just because isolate is more "pure" doesnít necessarily mean that whey isolate is better. Whey protein concentrate is still an excellent source of protein and concentrate has higher BV values compared to lean red meats, chicken, fish and whole eggs. Besides, whey protein isolate does have its disadvantages one of which it's more expensive than concentrate usually twice as much!!. It is also debately that because Isolate has been filtered more than concentrate some of the valuable immune-boosting protein properties have been removed and some say the protein is degraded more making it less useful to the body.