Q: How do we know if the vial is 15mg/ml or 17mg/ml or 20mg/ml?

A: The only way to do this is to test it on your own in the lab. The one that we are selling are 17mg/ml and 20mg/ml. We have a clinical trial report done by third party independent lab. Link : https://www.curefip.com/post/our-concentration-test-report .