It’s the batch. The brand is kits 4 less. They have different price ranges, like deluxe and supreme and then like a regular one (forget the name) and then the letter after it is which batch it is. So there was a deluxe A and then when that was all sold out the next batch was deluxe B. And all the deluxe ones are like 300ius I think and the supreme are like 200. So there was also a Supreme A and supreme B and now there all the way to F, so it’s the 6th batch of their Deluxe HgH. So if someone gets a vial tested from batch supreme D all the other ones from supreme D should be the same as that one