Used Wicked Labz 20mg (2 a day) 2 weeks on / 1 week off for a couple months — several cycles this way.
No difference in noticeable fat loss for me. However I did have a noticeable increased cardio output.
Developed a few small skin tags — I don’t know that it can be specifically attributable to the carderine though. I cut one off with tiny scissors that was visible on my neck (the largest, which wasn’t very big at all), and the others I’ve just recently began putting some iodine on a couple times a day. They’re slowly shrinking.