Having too much collagen in your body can cause scleroderma, which leads the skin to stretch & harden and even damage the internal organs such as kidneys. Thus, collagen gummies aren’t advisable for people with a high risk of kidney stones or related conditions. It is always advised to consume only the prescribed amount of supplements.
Several animal studies point out that excessive amounts of hydroxyproline, a type of amino acid, in the body which has shown to harm the kidneys. Like any animal protein, collagen contains hydroxyproline. There aren’t any conclusive studies to prove that collagen affects kidneys adversely.