I don't really like giving supplements since they are synthetic, but sometimes I add Zolcal D (liquid) or Calcivet Powder (powder form of calcium and Vit D3). I sometimes add Guardian Angel which contains prebiotics, vits and minerals. Nutrabal (spelling?) seems to be popular here but I haven't used it. @plumsmum Apparently the oxalates in raw spinach (that bind with calcium) might remove some of the spinach's own calcium but spinach is also high in other important nutrients. Since Leslie Moran told me something to that effect, I am not worried about feeding raw spinach. I'm pretty sure she's written something about it in Parrots Mag in the past.