Herbal Trace Minerals is a broad mineral support formula made from mineral-rich herbs rather than isolated minerals alone. Kelp is a key ingredient because it naturally provides iodine and marine trace minerals, while dandelion and alfalfa add further mineral and nutritive value from land plants.
This kind of blend is mainly used when you want general trace mineral support from whole-food style ingredients. Kelp is the ingredient most people will care about first, especially for iodine, but the supporting herbs help give the formula a wider nutritional base. Before buying, the practical point is that Herbal Trace Minerals is designed for overall mineral nourishment, not one single mineral target.