Humic substances are the wider category
A clear reference to humic substances: the wider category that includes humic acid, fulvic acid and humin, with links to technical and application context.
Humic substances are the complex, dark organic matter formed as plant and microbial material decomposes over long periods. In industry and soil science, the category is commonly discussed through its main fractions rather than as one single compound.
The fractions are traditionally distinguished by how they dissolve at different pH levels. That behaviour gives the category a useful structure, while the source material and processing still influence the final material.
Humic acid
Soluble under alkaline conditions and tending to precipitate under acidic conditions.
ExploreFulvic acid
Generally described as the lower molecular weight fraction that remains soluble across the full pH range.
ExploreHumin
The fraction not readily soluble in either acid or alkali and associated with more stable bound organic matter.
ExploreKeep the parent category separate from the commercial label
“Humic substances” describes a wider body of organic matter. A commercial product may be labelled humic acid, fulvic acid, humate or a blend, so the label should be read with the specification, source and COA.