Someone also told me that oil made from Cannabis sativa was the more effective oil - she said this one was helpful with her dog's arthritis, whereas others didn't help at all. So I ordered it, but heck it is strong! I got what I thought was 4% but it was 1500mg! I diluted it with flax oil to match my 400mg/4% but still, not sure about giving it to the birds. This vet here told me that CBD oil effects young people and old differently. That in old people (ie. with dementia or some other autoimmune disease) it goes where it is needed. And yes, apparently you have to find your own level, and that is hard to do in a parrot when you are afraid of overdosing. I think Dr Driggers said use the lowest percentage you can get eg 3 or 4%. 4% is the lowest I can get in the UK.