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For all the entrepreneurs wanting to bottle Cathepsin B (the "Brain-Healthy Protein"), unfortunately it has also been linked with tumour invasion and metastasis[1]. Further study is needed to know if the increase in Cathepsin B is a factor or simply correlation.

[1] http://www.ncbi.nlm.nih.gov/pubmed/14587299

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That's assuming the unscrupulous spam artists pushing nootropics and smart-pills even care about the adverse effects of the ingredients they're selling. And most of their target consumers will be too wooed by the use of a scientific term like 'cathepsin-b' to bother with their own due diligence.

Lebanese proverb - "If a rich man eats a snake, people call it wisdom; if a poor man does the same thing, people call it derangement."

English speaking equivalent:

_"Wealthy people with quirks are called eccentric. Poor people are called crazy"_

Terry Pratchett's quote?

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