Its label reads as follows: Mg 0.50% (chelated) Mn 0.25% (chelated) Sulfur 3.90% (combined) Zn 0.50% (chelated) Boron 0.02% Cu 0.25% (chelated) Fe 6.00% (chelated) The ratio of Fe to Mn is 4:1 in the hydroponic mix that I use, so maybe more Mn would be preferable. Also there is no molybdenum. Dave --