I had the same experience with GenLabs Clen! Switched to BP Clen and it was a night and day difference! But all the reviews seemed good for the GenLabs Clen so who knows. And all the other products I’ve tried from them have been great!
One of the most counterfeited HG products ever with Norma Deca and Zambon Winstrol...
Of course yours may be legit, I don't know where you got it from.
For those looking for quality clen, I'm using Mike Arnold's right now and I don't know if this batch is overdosed but it's definitely the strongest clen has ever hit me.