There aren’t any official dosage numbers coming from health authorities on how many grams of collagen one should take per day. However, most products on the market have prescribed dosage written on them. For example, the usual amount of collagen powder recommended on most packages is one or two scoops (tablespoons) per day. For collagen pills, it’s about one or two capsules. The amount you take is also depended on why you take collagen supplements. So that is something you need to take into consideration as well. The bottom line is (simply) follow the prescribed dosage in the description of the product and you’ll be good to go.