I think its best manufacturer names and brands stay out of this thread and rather one concentrates on the TYPenis Enlargement of protein. I always liked, rate highly from results egg protein, milk protein and obviously proteins from meats. Dessicated beef liver is fantastic aswell. Egg powder can be purchased cheaply by various supplement companies as a protein powder and the liver caps are also around.
Protein that works best for the human body to be taken up into the system and used is stuff that is more natural then manufactured, so think that when you decide which to go for. I suggest stay well clear of the fancy bullshit brands around the industry claiming alsorts of shit and having sports people especially bloated bodybuilders endorsing a product. Usually the tried and tested old school stuff is the best but not necessarily the one that sells the most as it looks and sounds boring but who gives a shit if it works so well.
Whey Protein is a good one but many get sucked in with the QUALITY such as 80% and 90% .. truth be told from studies I have seen it makes no difference in quality of protein, its the amount of it that can be digested and used in that particular sitting that is important, which is why the protein should be organic such as eggs and liver.