The ingredients as stated on the label in DM reverse is more of a distraction to the chemical that is doing all the work. Its name is ethephon (chloroethylphosphonic acid). Ethephon used in the correct dosage causes ethelene stored in plants to be released. I am guessing that the vagueness of DM to put the real contents on its labels is more to do with the history of how some of its other products were ripped off in the past (Superbud) rather than snake oil sales. In fact this type of method of hiding the contents has become somewhat the norm amongst these types of suppliers. The list of K based ingredients is related to the 'other' stuff, the phosphonic acid side of chloroethylphosphonic acid (ethephon).
The secret to ethephon is the pH range it works in. Which is why DM now sells Reverse in a ready to use state, no water added, so that the pH is set exactly where it is supposed to be.
Ethephon endogenously releases the natural stores of chloride, phosphates and ethylene gas in plants. Ethylene is a female hormone so when used in correct doses it will in a sense 'feminize' a plant.
Ethephon is found in a lot of products used by commercial growers, it seems that DM has repackaged it as DM Reverse.
It is also important to note that the correct usage is very important when using plant growth regulators (PGRs). You hear a lot of growers over using these types of products thinking that it will, in this case, make their plants more female by applying it twice that as stipulated on the label, or sometimes three times the instructions. What a lot of growers do not realise is that these growth regulators have a dual use in the horticulture industry. In weak dosages such as DM Reverse, PGRs are used to slow plant stretch, promote larger stems, feminize plants etc etc, but at more concentrated levels many of these PGRs are used as herbicides.
An example of this are the range of auxin based products sold in cannabis stores like Nitrozyme. Sold as a PGR to stimulate cellular division, it works well. But the same auxins that work to stimulate cellular division are also used in concentrated form in herbicides, the most famous are the synthetic auxin sprays used in Vietnam. Even a quick read of the Wiki page on Agent Orange yields this information.
http://en.wikipedia.org/wiki/Agent_Orange
"The earliest form of the compound triiodobenzoic acid was studied by Arthur Galston as a plant growth hormone."
Just a quiet warning to stick to what is on the label.