white marks just one nail AFTER taking supplements!

I have several white marks appeared in my middle finger nail, right hand. Normally you would associate this with some kind of deficiency, but I've taken zinc supplements for a while, and recently started to take calcium supplements and an aloe vera drink which has a lot of minerals and trace elements. It's only since I took these extra things that the white marks have appeared. Does anyone have any info on this - and why it would affect just the one nail (the rest are stronger and clearer than ever - and my general health and energy levels are really good) Any info most welcome.