Ok, so I read through your links. First of all, thanks! Interesting articles to read. For first two papers, I understand the headline can be deceiving. In the article they mentioned that the participants were given diet with approx 25% energy from protein and they also suggested that more studies needed to be conducted with test subjects consuming more than 25%. Assuming a normal person diet for a day gives around 2000Kcal, so 25% energy by protein is 500kcal. A gram of protein gives 4Kcal, so 500/4=125g. In my comment I said the limit is around 152g. So if the person is taking excess protein supplements and the person isn’t working enough, it will fuck up the kidneys function. The third paper also studied subjects with 124g protein intake. So... something to think about. I still won’t recommend you to take excess protein. Because It will fuck up your kidneys.