Humic Acid (HumxPlus) HUMICO Humic Acid Organic Fertilizer is a natural, eco-friendly soil amendment derived from humic substances, which are the major organic constituents of soil, peat, and coal. It is also found in many upland streams, dystrophic lakes, and ocean water. Extracted primarily from leonardite, a highly oxidized form of lignite coal, humic acid enhances soil fertilit... https://www.ihumico.com/humic-acid/