WB , Don't forget --- Fulvic acids are much smaller molecules than humic acids, ranging in molecular size from 1,000 to 10,000. They're soluble in water at all pH levels, unlike humic acids, which are only soluble in alkaline solutions. There are two types of fulvic acids–fulvates, which are molecules bound to minerals, and free-form fulvic acids. Fulvic acids consist mostly of carbon, hydrogen, oxygen, and nitrogen. Like humic acids, they're formed through microbial decay. They are golden in color and are more biologically active than humic acids, due to an oxygen content that is nearly twice that of humic acids. The principal benefit of fulvic acids is their ability to bind to nutrients and transfer those nutrients into plants. In fact, fulvic acids are the most effective carbon containing chelating compound known. This is due to fulvic acids small molecular size and electrical charge. (Although they're small, they can carry many times their own weight in minerals.) Fulvic acids can be thought of as the railcars that carry vital nutrients from the soil into the plant. 
