It all depends on how much meat or fish a person is eating. With the amount of meat I eat right now, my estimate is that I am getting about 1-1.2 grams of creatine per serving. That's a lot less then a 5 grams from supplements but at least it's something. If I do that 7 days per week it's more than enough to keep my creatine tank filled up and help the body to synthesize more creatine naturally.