Yeah, I've read about safrole being slightly carcinogenic in rodents. And I'm sure it would most certainly cause cancer in California (everything causes cancer in California). But for the rest of the world, I honestly don't think that a human could consume enough to do any harm. But then again I drink from Nalgene bottles and microwave my Tupperware containers. So I guess I like to live on the edge.
Please note that I'm not making fun of you personally. Its just that there are so many more common yet deadly things such as cholesterol and heart disease, or just driving a car. I'll be damned if traditional root beer ends up being the thing that takes me out.
Ok, that's my soapbox. I am still looking for a good recipe. So if anybody has one, I'd love to hear it.