There is plenty of protein already in Huel. Why recommend that out of the many options available?
@NanaC05 if you use the unflavoured/unsweetened version, why not try giving the official flavourings a go? Nausea is never normal in my opinion. If it keeps happening and you are sure that it only happens when you drink Huel, I would recommend either stopping drinking it or reducing the amount you have to see if that makes a difference.