To me it depends what the suppliment is....I love LK and will add some to sick plants regularly....but not at full strenth as Stinky says....(Stinky always says cool stuff ) and A TOUCH of sweet doesn't hurt imo (a touch is NOT 15/mlgallon) but I could drop the sweet easily in a sick plant and not be upset either. 100ppms of LK works out to about 3-4 mls per gallon.

PS....my bottle of gravity still sits unused.....staring at me....chuckling softly......waiting.....