Either at anagenic.com or chemyo.com. You could also get it through Alibaba (cheaper) but I'd probably send it away for testing at a third party lab. Which would cost time and money. I got mine at anagenic, shipping was surprisingly quick. Most people recommend a 5% solution, but I'm currently using 2.5 %. I think it's important that people try to use the lowest amount of drugs possible to achieve their goals and move up as needed. I mix mine with minoxidil Max. I cut it with ethanol so I end up with 7% minoxidil. I take 10 mil minoxidil and 10 mil ethanol and mix in .5 gram of RU 2.5% I keep it in the fridge lasts me 10 or more days. I keep the powder in the freezer triple bagged.