My options for Whey protein are limited because I live in a foreign country with only a couple of places to get protein shakes.

Today I went to buy Whey protein but they were sold out.

My only viable option (a low carber) was 100% Soy Protein by a company called "On" based in the USA.

What exactly is, soy protein?

How different is it to Whey?

Is it much worse than whey?