We have had good luck with a product called humuflour, a water based extract. But the supplier now only sells in a 5 or 6 variety combo pack instead of by individual variety. Not gonna work for us.

Kalsec appears to have a few products, got one on order but haven’t received yet. I believe barth haas sells them too, but was told the sizes are more geared towards big producers. On the interwebs i ran across an outfit in the uk that seemed to also have a product but not sure i wanna deal with extended shipping lines.

Anybody know some other sources for water solubles you can add on the cold side?