I will be writing an article on this matter but here are a few quick points:
-The maximum amount of protein any human being should use is 1 gram per pound. Countless scientific studies have proven that anything above that will not yield any benefit (and in fact will harm your kidneys).
-Plant protein is superior to animal protein. In specific, red meat should be your last choice for protein. AT least half of your protein should come from plants. The rest should come mainly from poultry and fish. A little red meat should make up the rest.
-No more than 25% of protein should come from protein shakes. Although the your body absorbs it at a relatively similar rate to food protein, the nutritional density of food will be far more beneficial in gaining quality lean body mass.
-Take care of your liver. It is the workhorse of your body and is responsible for leading healthy growth.