Luis, the confusion is understandable, I too am experiencing it. The BB site claims 500mg of cbd per 2oz portion, not 250mg, which they give as the 1oz portion of cbd. I do not know how to translate the mg to %, they claim to have as high as 26% cbd in an extraction. It almost appears by the information you have given that the BB claim is almost twice as high as the German claim - 250mg@50ml v. 500mg@60ml.
http://www.conversion-metric.org/volume ... milliliter
Doing a cursory search conveys that 15 drops <= 1ml, which is half the claim of BB and explains why I ran out of their 2 month supply in a little over three weeks. I took 7-8 drops twice a day and was squirting, not counting to both cats, though Pretty not every time I and Tabitha took the oil.
So it seems then there is a fundamental error on the BB site and essentially doubles the cost of the medicine, which makes the 50% off wholesale pricing that much more attractive.
http://www.bluebird-botanicals.com/uplo ... empcbd.pdf
There are also links to potency test results that I have had a difficult time making heads or tales of. I have however stopped worrying about after having seen the oil in action, all I need to know is does it work and I can certainly answer in the affirmative there.
When speaking of synergy, I am speaking of whole plant synergy, not thc and cbd only, there are many more cannabinoids with medicinal benefits. There was always this option of high cbd and low thc, it was just pushed as a drug so hard as opposed to a medicine, everyone breed for THC and not CBD because all that was ever reinforced was the "high". Luckily we woke up before we breed the CBD right out of the plant all together.