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I've taken ON Casien in the past. Then I've heard of studies done on rats where casien protein caused liver damage. Granted, I don't know how much casien they gave to the rats, so anything taken excessively may be harmful. But there is other literature that states that casien is one of the worst forms of protein to take. If the only advantage that casien has (over whey) is that it digests slowly, then I rather not take it. As someone mentioned earlier, it probably is mostly marketing. Another supplement to spend your money on.
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