I don't know much about Oxypowder . I tired it several years ago and it didn't agree with me.
Put the word " Oxypowder " int the search window on the Liver Flush page and you will find plenty of threads that discuss Oxypowder in liver flushing.
I recommended Epsom Salt and magnesium citrate because they are the most commonly used on the Curezone Liver Flush Forum . I don't think you will have to worry about overdosing on magnesium, most people are deficient. Epsom Salt and magnesium citrate have the advantage of dialiting your bile ducts. I dont' think that oxypowder can do that, but it should clean out your insides as good as magnesium citrate or epsom salt.