I did read the labels, but as I said it's been a light feeder, if I went by the 4ml per litre on the bottle whoa! And I have read conflicting ideas on when to start big bud as well as people saying an is a complete waste of money and time and not to use it at all, but it's paid for so I'm gonna use it lol, I was just wondering if as an additive it would be more benificial to me to save my ppms for the grow a+b and take it light on the big bud, or if it would be better at this stage to go lighter on the a+b and heavy on the additive(higher pk on the big bud than the a+b) and hadn't found that perticular piece of info via the nets. I did call the an folks and they said to keep an even ratio of all products to stay in a comfortable ppm range for my particular grow and suggested overdrive also, cool thing was they said they would send me a coupon for a free sample valid at any local retailer that carries it! Thanks for your timely response and happy growing!