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In the 1600s, alchemists were hardcore into finding eternal life, and they came up with some pretty disgusting theories and supposed elixirs along the way.

One such alchemist, John French, used to prepare a “brain tincture,” if you can guess what that was made of.

He then left the mixture to sit inside of horse manure for six months, until it became a liquid and could be drunk.

The worst thing of all? French had plenty of other colleagues trying out similar medicine.

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