I wouldn't go down the extract rabbit hole if you live in the UK as it's hard enough to get good quality kratom never mind being dependent on extract which is going to be a nightmare without a reliable source once you take you kratom usage to that level. There is a few usa venders who will try to send to you but it's always going to be a gamble on each delivery as more and more packages seem to be getting stopped recently. I personally completely quit now after using high quality kratom for 5