Is exposure to amyloid beta proteins dangerous?
Amyloid proteins form insoluble aggregates and they cannot pass through the dermis. The aggregates can be (and frequently are, in the intracellular context) resistant to digestion but they would not be absorbed from the gut. Moreover, these peptides are not "toxic" per se. It is their property of forming aggregates and plaques that gives rise to the pathology observed in the associated neurodegenerative diseases. It is important to note that neural tissue does not regenerate like many other tissues in the body and that is one reason why neural tissue is vulnerable.

So unless you inject some of these proteins inside your cranium, it is unlikely that you will suffer from any problems beacause of Aβ exposure.