Canna Butter is probably the most popular way to extract Cannabinoids from Cannabis. Use unsalted butter. Animal fat is the right kind of fat for your health and is ideal for baking. You do not need to decarboxilate the Marijuana if you are going to bake with it. Personally I would not suggest baking with it if your intensions is medicinal. Most Cannabinoids will deteriorate in the cooking process however about twenty percent of the THCa content will survive and will definately have a nocotic effect. 

Canna Butter.