Question on Kelp

I have a question. The Alkalizing drink you have on your site has Kelp powder as an ingredient. I could not find the PH value on any of the food lists you reference for Kelp. Since it is an ingredient I suppose it is high alkaline, but how high? Also, if one could not obtain it or really cannot handle the taste, what could be a substitute? What would be the efficacy without it?
Thanks, V0 Tweet