I ordered 10qty of Tirz 30mg, and the product is excellent. I sent one of the vials out for independent testing and it came back 99.76% pure and 30.2mg quantity, just about perfect! I've been using it for about a month now and it works great. One thing to know about this vendor is they do not print batch numbers on their vials. They track batches using the cap and crimp color, and you can match the cap and crimp color to the description on the COA posted on their website. Just wanted to let everyone know about that. I highly recommend this vendor for all your research peptides!