Depends on lights an environment. For me I'd say it's around 4oz per 1k difference. Could be the specific cuts I'm running tho. Some will love it some won't be much difference. I've never seen any bad side effects, keep dosage low an run it longer. If canna pk13/14 was as expensive as canna boost I probably would not run it. At their respected prices they are both worth their money x10What kind of yield increases can one expect with PK boosters say on some Cookies hybrid? Are we talking single digit or double digit percentages?