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There's a lot of shadiness in the humates world. I find it especially shady that every single nutrient company (virtually) carries a humic acid product they claim is superior without specializing in humates.
I settled for Humisolve by Bioag. They have two very very very very well respected scientists that have dedicated their lives to humic acid research. The apprentice of the two formulated nutrients for a decade or so and is familiar with a lot of products on the market. There's an article he did for Maximum Yield called the Dirt on Humic Substances. This and other resources can give you an idea of how companies measure the humic (both the Humic acid and fulvic acid - fulvic being important for nutrient uptake and plant health where humic acid is more of a soil conditioner) contents of their products if they give you any of that information at all usually it's the fulvic acid content that is very low. I don't know if Fulpower or Humisolve are the best humic nutrients on the planet, but they're definitely very very good, have very very intelligent people working for their research and development, are reasonably priced, and share all the information they can provide you with. I was on the phone for approximately an hour one day and maybe half and hour to forty-five minutes another day before putting in my order asking all sorts of questions. I don't suggest you do this because they would likely ignore any future calls from my number, these guys just know their shit so well it's hard not to try to pick their brains.