At least in the UK, where there is a small, highly regulated, legal medical market, the few carts that are available contain no additives at all - only cannabin

At least in the UK, where there is a small, highly regulated, legal medical market, the few carts that are available contain no additives at all - only cannabinoids and terpenes. You can look up Theraceed and Columbia, both of which IIRC are sold in the US TOO. They also cost around a whopping £85 in the UK, for just ~350mg of THC, which is some serious price gouging :(