Hi, First of all I would like to say a few words about myself as this is my first post. I'm from Poland, long time smoker, vaping (with quality e-cigs) since approx. 2 months, and since then I switched to vaping instead of smoking 100%. At the beginning I was buying ready e-liquid's (first 12mg, now 18mg - and that's the right amount for me). Unfortunately I couldn't find "the right one" so I decided to make my own So... I read about DIY liquids (tutorials etc.) and I decided to order NIC BASE. Unfortunately in Poland you won't buy a base stronger then 20mg/ml so I ordered from HILIQ (this shop was recommended by a guy that works at a local vapeshop). The process was ...a bit tricky (and the delivery costed as much as the base itself), but eventually I received my NIC BASE (freebase nic, 200mg/ml, 150ml). I was surprised by the color - it was amber-colored. As it was 100% in VG a was shaking, shaking, shaking ...and shaking some more (approx. 10-15 min intensive shaking). Then I made my desired 18mg/ml liquid with ingredients (VG, PG, aroma) previously tested on a "ZERO-NICOTINE" e-liquid (which vaped great, lovely vanilla-like taste, great clouds etc.). But... When I made my liquid WITH that base (everything literally sterile, syringes etc.; counted 10 times; all precautions taken; waited 1 day to aroma blend in) it TASTED HORRIBLE. The after taste was chemical-like, salty (? - hard to describe) and ALSO it produced HEAVY HEADACHE (BUT NO dizziness, NO nausea, NO anxiety - so it couldn't be NIC OD). And if that wasn't enough it also produced (after 10-15 "clouds") THROAT ACHE (but not the kind that "scratchy" liquids produce - it WAS LIKE WHEN SICK WITH THE FLU) - I had to take some throat medicine for that. I contacted HILIQ distributors in PL - and told them that something's not right. Fortunately support for polish customers was quite good, and they (after my suggestion) changed the product to: "NIC SALT A" 200mg/ml 100ml in PG this time. But... When this arrived (although the color was perfectly transparent), and I made my liquid - THE F...NG SAME!!! The after taste is a little lower, and there is NO sore throat side-effect, but after a few (3-5 clouds) my head is pulsing with pain!!! There are some moments (like this morning) when I was able to vape approx. 10-15 clouds without that aftertaste and then there was no headache ...and EVEN some of the aroma was present. But soon after that AFTERTASTE+HEADACHE!!! SO MY QUESTION IS - WHAT CAN I BE DOING WRONG? ...OR IS THIS JUST FAULTY SALT-NIC-BASE? HAS ANYONE HAD SIMILAR EXPERIENCE? I shaken everything (the base before mixing[15 min, it had a little foam even], the liquid after mixing[frequently]), I keep the base in a refrigerator, I use sterile equipment, I made the "zero-nic" base as a control and it vapes great, I let it steep for a day or more. Everything according to the book... What should I do? Any solutions or is this a refund situation? BTW: NIC-SALT-BASE (Salt A) batch number is: MD:2019.03.13 - anyone has the same batch? Same problems? Thanks in advance cya P.S.1. When I vape and i don't come across this bad after-taste, the e-liquid seems (even though I made it weaker - 12mg/ml) to give me dizziness, unpleasant "rush" - a bit like OD, but no HEADACHE and no nausea. Maybe it's (also) much stronger then declared?