Organic Calcium for my Garden

The man at the Farmer's Market recommended calcium nitrate to give veggies a nice "shine". I use eggshells and bones in my compost - but I don't have very much by volume. What can I safely add to my veggie plots?

I use crab shell, but it's expensive. A bucket lasts me a season.

http://www.wormsway.com/detail.aspx?t=prod&sku=NHC410&AC=1

Some people recommend dolomite lime, and although I have used it, I am cautious because it will also change the pH of the soil.

Bone meal will also add calcium but it breaks-down slowly.

http://www.wormsway.com/results.aspx?t=prod&search=bone%20meal&cat=all&AC=1

Thank you.