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Hi Rob, my hubby has been suffering with Grover's for several years now. Last year his arms were so bad and inflamed (that could have been a different skin complaint) that we asked the GP if he could have full blood tests to determine the CAUSE. Following the blood tests, he was diagnosed with Multiple Myeloma!! Probably had it for years. Since March this year he has been taking Curcumin C3 with Bioperine 8g daily for the MM but sadly it has not helped his Grover's. I'm sorry to disappoint although it may help you, it's a great supplement.
We are now going to try Magnesium, (mentioned by Anna); Reishi + Shiitake mushroom extract (mentioned by Francesco); and Molybdenum (mentioned by Jerry). All worth a try IMHO.