This is just one ingredient out of many you can use. It depends on the maturity level of your plant(s).
In essence, It is a source of nitrogen in the organic form. Like using a calcium/magnesium additive, it will help "green-up" your plant and boost growth, but only in spurts. You see this form of molasses is best used after your plant is up and running, not when it's a seedling. Look at this molasses as a "pick-me-up" for your plant. And when you see those leaves turning yellow your experiencing a magnesium deficiency of sorts and/or a nitrogen deficiency. To gain back green leaves you can use this fermented sugar beet molasses to bolster your leaves back to green and spike added growth as well. I use this product as a filler in-between my regular feedings and during flowering I make up my own Phosphorous boost by making a tea out of organic bone meal (adding boiling water to bone meal makes a great tea of 2-14-0 ratio). My grow is out of doors, not hot-house, or in doors. In door grow is a total different beast, you have to be extra careful not to burn your plants. I know this is a lot of jargon to capture, but simply put look at this type of molasses as a great in-between organic feed for your plants -- they love it.