Charlie has already said, several times, that his tonic is hand made for the individual. In my mind, this means that the ingredients would be varying in their combination and quantity.
I had to go my doctor last year for a sinus infection. He made me take an antibiotic for 10 days. I would have thought that antibiotics cleared only bacteria. Never the less it worked; and it really did take the full 10 days. I have a very close friend, who also had a sinus problem that just would not disappear. She went to the same physician and got exactly the same antibiotic; but a different strength and duration.
It is clear to me that interviews are important. Selective combination of herbs is important. Dosage and timing is important.