tidbits of infomation I found
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When a portion of a normal liver is removed, the remaining liver can grow back (regenerate) to the original size within one to two weeks. A cirrhotic liver, however, cannot grow back.
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Liver failure can happen in two ways. First, the acute damage can simply be too serious for liver cells to deal with before the person dies. Second is a more protracted process, where damages accumulate.
Suppose that the liver has taken damages from infection/drug/alcohol/etc. Then, instead of liver cells regenerating, scar tissues can form in the liver and replace them. Scar tissue is tougher than cushy liver tissue, so this leads to hardened liver with reduced function. (Cirrhosis) If this damage keeps piling up, the liver will eventually be overwhelmed and lead to chronic liver failure.
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Liver regeneration is a somewhat misleading term. The liver cells regenerate but there is more to it: the liver is arranged in small "units", called a portal triad. Inside a portal triad are: an artery, a portal vein, a bile duct, lymphatic vessels, as well as liver cells (parenchyma). While the liver cells can regenerate, the triads cannot. So if you damaged, beyond repair, a triad, allowed time for "regeneration", then looked at it under a microscope, you would see liver cells and scar tissue, but not the other components of the triad, which are essential to liver function.
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I would say this - Serrapeptase can and does heal internal scar tissue although doctors will say nothing can be done. Virtually the entire body can regenerate so one should never give up. Of course there is always that tipping point where body can simply be too overwhelmed too quickly.