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Humic acid forms naturally in healthy soils. Its what makes them black. The best illustration I ever saw of this was when crimson and camo documented the change in his sand over a couple years of mowing with no dead period for his soil. I believe he turned his sand black 3-4" deep simply because he didn't stop the natural production of humic acid by stopping the growing cycle with tillage or spraying.
If anything, stimulate life with a little lime or gypsum, and some clover and chicory. Then you won't be able to stop the formation of humic acid. All that foo foo sprinkle is to band aid the biological damage done to soil in pursuit of monospeciation.