I would still take some.
From what I heard, although there is creatine in beef, you have to eat a ton to get the same amount that's in a teaspoon of the powder.
I take a teaspoon a day, sometimes on an off day I forget or don't bother. No big deal to me, but I wouldn't go any more than a couple days without it.
I also heard that it doesn't get out of your system for about 30 days once your body is saturated, but the levels decrease significantly after a few days or a week.
Anyway, I don't have any studies or anything, just going off of what I've heard.