I've used standard e-juice concentrates in D9 distillate and they work fine. 10% flavouring is usually a good starting point, maybe less for really strong flavours.
The main thing to consider is that these flavours come suspended in propylene glycol which causes the resulting distillate mix to be noticeably less viscous than when using terpene blends. This can cause the carts to burn out a bit quicker than normal but I use 0.5ml carts and haven't had any issues with those. The 1ml carts might not perform as well.
The terpenes-uk.co.uk site has flavour concentrates which don't have any terps so might want to have a look at those. I've tried a couple and they're decent, if a bit pricey.
I use flavourexpress.com for e-juice concentrates but any good vape shop should have some too.
The main thing to consider is that these flavours come suspended in propylene glycol which causes the resulting distillate mix to be noticeably less viscous than when using terpene blends. This can cause the carts to burn out a bit quicker than normal but I use 0.5ml carts and haven't had any issues with those. The 1ml carts might not perform as well.
The terpenes-uk.co.uk site has flavour concentrates which don't have any terps so might want to have a look at those. I've tried a couple and they're decent, if a bit pricey.
I use flavourexpress.com for e-juice concentrates but any good vape shop should have some too.