I am using MK-677 from the same source that the OP is using. I am also using 5 other peptides from this same sponsor and have had results since I started them within the last week and a half. Many reputable posters here vouch for this research company, but bad batches do happen. The only way to ensure the legitimacy of your product is if independent third party testing is done on their products (one of our sponsors here actually do this, this price is just a bit more). Bad batches do happen, and I would reach out to the company and explain your situation, but there are a lot of variables that come into play here, like perhaps the MK-677 you received had an accurate dosage of 25mg/ml, but you were simply a non responder. I've had things like this happen to me in the past as well. Reputable sponsors sometimes get a bad batch of raws once in a blue moon, and if these reports are verifiable, I know they go out of their way to make it up to the customer. Just my $0.02.