Comment: Formaldehyde

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Methanol converts to formaldehyde, yes. However, the body recognizes that formaldehyde is very toxic.

Formaldehyde is thus very efficiently metabolized to formic acid in the body. It does not bioaccumulate. I don't know if it can cross the blood-brain barrier, but so can many other small molecules. You'll get a far bigger dose of formaldehyde by smoking a cigarette than ingesting a soda's worth of aspartame.

Formic acid is the same substance many insects use in their stings. It also does not bioaccumulate.