arguably. the bloom additives mainly contain carbs to pump up buds more than they would have been without them. i cant attest to that as i have never used any. my advice is to make sure you have your nutes dialed in (actual nutes) three primary two secondary and micro nutrients. then once you have those then you can add the extra, i/e bud candy, sweet, etc. it wont make a diff if you dont have what the plant needs, verses what you want it to have. so to answer your question. "they are supposed to" but i cant say for sure if they are bunk or not. im going to add them to my garden soon so i will find out then