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Human skin contains oils which aid in blocking out the absorption of chemicals which would harm or irritate the skin. Those oils contain proteins. Pineapple contains a chemical compound called bromelain which has the ability to break down these proteins. This is bad, because it can then act on the skin itself (which is also comprised of protein molecules). ...


Pineapples contain a substance called bromelain. It is a protease, which means it breaks down protein. It can therefore slightly damage the cells of your mouth, causing the irritation you describe. It has a culinary use as a meat tenderiser. Bromelain is primarily concentrated in the stem of the pineapple but is found throughout the fruit. There is no way ...

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