Heartland Vapes is a good source for inexpensive nicotine concentrates. I find their basic (non-premium) nicotine to be clean, clear, and smooth. As a business, I can't recommend them highly enough; fast, attentive, and responsive to communications. And, at $45 a liter (1L 100mg/mL); the price is hard to beat.
@Kurt has a few posts scattered around the forums that agrees with you Anna. There are just too many "unwanted" and "unknown" components in most home extractions (and sugars are known high-risk additives), that the average DIYer's kitchen lab, can't even begin to remove. As a professional chemistry professor, who is active in vaping safety research, I place a lot of weight in his recommendations.
I respect @ImJustAvg's right to mix as he/she sees fit; but I would never encourage anyone to mix in this manner.
