Advanced Hop Extracts by Kalsec Brewing Solutions are post fermentation additives derived from hops. Each 8 oz/250 gram bottle is designed to be used with… 50 to 75 barrels of beer.
Two varieties [Trop Hopical and Hopfenatic] seem to be focused on hop flavor and aroma, While one focuses on head retention [Head Master] and another focuses on adding bitterness [Bitter Blaster]. Since these are for post fermentation, they should allow you to correct and adjust beers on the fly.
Also: 5 Recent Hop Finds