What is a good protein powder to use for my smoothie drinks?

I use to use a protein powder about 30 years ago that had no flavor, taste, smell or any kind of sugar or sugar subtitute in it. It was made out of egg shells and this powder had the look and feel of all purpose flour. I am having trouble finding it, does anyone know of something like this that I can purchase at a Vitamin or Health Food Store? It made the smoothies real thick and delicious.
- Spinelli Kelly