Nutrients

there's no such thing as a bloom booster, so no worries. this is a good thing. you'll form a baseline using normal stuff, and then if you ever try the magical stuff, you'll see it makes no difference. If you look at the ingredients of those products, you'll find it's mundane stuff you can find elsewhere for much less if you want to incorporate it into your fertilizer regimen. You want to provide a consistent well-balanced diet. There is no need to play mad scientist by add product X at week 3 of flower or product Y 2 weeks before harvest etc etc.. That's all self-fellating nonsense with no evidence to support it. About the only thing you have to do differently in flower phase is maybe drop your N 20-30ppm while keeping the other stuff mostly the same. Plenty of studies show that amping up P or K does nothing but waste extra p and k, and possibly burn the shit out of your canopy, which is far more of a negative than any potential positive they bring. Light and co2 are the limiting factors, not fertilizer. Your light and co2 wil dictate how much you can feed, because that will dictate resulting rate of growth. keep the plant healthy and happy. you feed a bit too much, you dial back and take note for the future. Repeat until it works on 99% of all plants with zero problems seed to harvest (within reason). When that's the case, you know you are giving it as many building blocks as you can to match the current growth rate. The light you use is 100x more important than the fertilizer you use. Fertilizer is made of ubiquitous commodities. ammonium nitrate is always ammonium nitrate. there are no quality grades of ammonium nitrate, for example, so don't pay extra for a brand name fertilizer. AN is fairly expensive choice. think they are up around 15cents per gallon or more? I pay less than 1/4th of that by buying dry fertilizer in bulk. A bit more upfront cost, but dry fertilizer has a shelf-life so long that you can take decades to use it up. I average about 25-30 USD per year on fertilizer for 80sq ft worth of growing across 2 cycles. there's no reason to make fertilizer a major expense.