A real PK booster is just extra phosphorus and potassium (often with some trace elements) for the weeks when flowers bulk up. If your base feed is already doing the job, you gain a bit at best. Light, climate and a decent feed schedule beat any bottle.
Be careful with PGR-based products (plant growth regulators). They are a different thing from a normal booster, they are regulated, and they are often not wanted in what people consume. If you want a mild stimulator, something like the BioBizz stimulant pack is the normal-nutrient route. Use any booster as the label says.
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