I just started DIY juices, and loving it. The highest nicotine that most labs will sell is 100mg solution. You can get it in VG or PG base. I use this simple on line juice calculator,
eJuice Recipe Calculator , that's real easy to understand and use. Have another one down loaded, but this was easiest to understand.
I usually make a 10ml sample when trying a new recipe. That way if it sucks, no biggie. Make sure and check out the DIY section. Lots of helpful hints and suggestions on lab ware needed, vendors, etc. My first order was 18mg nic VG base, because they were out of the higher levels. Also ordered some mixing flasks, syringes for measuring, 9 flavor extracts that sounded good and some PG base,
When I received notification that there 100mg nic base was in, I bought some, and VG, 5 more flavor extracts, and a couple more pieces of lab ware. Glad I got the nic base, 2 days later they were out. Probably have enough liquid for a year now.
Was so amazed at the taste of my first trial, that I made 50ml and wrote down the recipe in by e-book, before I forgot what I did. Used some Captain Black Tobacco with a dash of Cinnamon Danish, ~80% VG, 9% flavoring. Was one of the best juices I've Vaped. MBV has lost a juice customer. lol
I was hesitant to try DIY, more so than I was to try rba's. But after thorough research and studying the DIY section, and seeing what was up, plus all the whoopla about possible regulation, I decided to go for it. Am so glad I did. My juice cost is now about 1/4 of what I was paying from the vendors I used. I can adjust the flavor, nic level, and VG/PG %'s to my preferences. Get low on juice, it's off to the lab I go. lol. May still buy one or two of my favorites until I learn to replicate the recipe, but for now I am juice phat. lol