Are you doing a talley test? It's so cheap and easy.
I know there's some controversy over it not being very accurate but it's so cheap and seems to be a rough guide for me. When I don't taste any zinc my face is breaking out like crazy....when I taste it then face is much clearer.
on copper...really not sure what I think of it's place in the whole equation. Andre Voisin's book "Soil and Cancer" puts a whole different spin on copper. Appears to be needed for critical cancer fighting enzyme in the blood. I wonder if copper could be malaligned like Iodine and what's really needed is more zinc to properly balance the copper...not less copper???