Collagen is the most common protein found in the body and supplementing collagen in our diet has proven to yield many benefits. There is a lack of any evidence that links a high protein diet to renal failure in healthy individuals.  In fact, a meta-analysis was done in 2018 of data collected from 28 papers as far back as 1975, which clearly showed that a high protein diet did not affect the function of the kidneys in healthy individuals (20). Many studies have been done examining the effect a high-level protein diet (3.4-4.4g/kg/day) has on the kidney function, and they showed no adverse effects on kidney or liver function (21) (22). So, to conclude, in individuals having no preexisting or established kidney issues, the intake of collagen supplements will not cause any harmful effects on the functioning of their kidneys.