These simply don't work. Don't waste your money.
I bought 6 bottles of the Ultra Drop at a cost of $1214 and used for 7 months with absolutely zero results. I had brown eyes when I started and I still have brown eyes now.
The company itself is very sketchy, they claim to be an international firm based in London with many employees, but as far as I can tell there's one person called Jan Freeman operating out of some anonymous state in the USA.
They offer a guarantee, but good luck trying to get hold of Jan once the time period has elapsed. Before any purchase is made their responses are instant, but as soon as you experience a problem they're nowhere to be seen.
An expensive lesson for me and I hope anyone reading this genuine review (I have an order number and sales receipt) will save their hard earned money and not be duped like I was.
I've given Jan plenty of opportunity to reach a resolution but have been largely ignored, I had to do a chargeback on my credit card in the end because their "money back guarantee" is a sham.