According to this:
https://www.vawa.net/YANTable.pdf
GoFerm is, gram for gram, a little more than half the YAN that Fermaid-O is. If you're pitching yeast at 2g/gallon or less, then yes, it may not be much, although it's not nothing. On the other hand, if you were to pitch an entire 10g packet of dry yeast into 1 gallon of must, then the matching amount of GoFerm would be 12.5g, which is a not insignificant mount of YAN.
I have no idea whether the above table of YAN values is accurate, or even a reasonable approximation. I haven't yet attempted to confirm it.
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On a different topic, meadmaderight says it uses this formula for TOSNA:
((((Brix x 10) * N requirement factor for your yeast) / 50) * Batch size in gallons) = Total grams of Fermaid-O needed
*Nitrogen requirement factors are: Low = 0.75, Medium = 0.90, High = 1.25
https://www.meadmaderight.com/nutrient-additions.html
However, plugging in some example numbers, it becomes apparent that the TOSNA 3.0 calculator must be using a different formula: the TOSNA 3.0 calculator output doesn't match the formula output. Nonetheless, the formula's output
does match the output of the batchbuilder calculator:
https://www.meadmakr.com/batch-buildr/ Because the formula is the same as what the TOSNA 2.0 formula was, it's clear that the TOSNA 3.0 formula is different and has not yet been posted--at least not on the public portion of the meadmaderight website. The TOSNA 3.0 calculator calls for the use of
more Fermaid-O than a TOSNA 2.0 calculator would have.