Hey degarg,
Since you found the link on bodybuilding.com, check out their forum
http://forum.bodybuilding.com and use the search function.
I have been able to get a lot of information from the forum.
Answer to your question: \/
Are all protein supplements the same?
No. Protein supplements can be made from a few different source of protein. These include milk protein, egg protein, soy protein. In addition, not all protein is absorbed in the same way in the body. The better a protein is absorbed by the body the higher the Biological Value (BV) the protein is said to have.
What is the BV rating I see associated with protein?
This measures the amount of protein ( or more precisely - the nitrogen) retained in the human body per gram of protein absorbed. This measure started out as a percentage - with a whole egg being at the top of the chart - 100% nitrogen absorbed. However, things got a little more confusing when Whey Protein was discovered. The problem is whey is a better source of protein than an egg - so it actually scores higher than 100. This means the percentage must be dropped - because greater than 100% does not make much sense. So, today BV is a number which lets you compare different types of protein. Currently 159 is the highest possible BV. Here is the BV of some common foods:
Protein BV
Whey isolate 110-159
Whey concentrate 104
Whole egg 100
Cow's milk 91
Egg white 88
Fish 83
Beef 80
Chicken 79
Casein 77
Soy 74
Rice 59
Wheat 54
Beans 49