Assertion: endogenous formaldehyde | /r/CreatedBy | the body
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text: But an alternative reason may very well be the fact that exposure to continuous, uncontrolled formaldehyde coming in from environmental sources may simply exhaust the internal metabolic mechanisms that have been evolutionary developed to handle small and predictable volumes of endogenous formaldehyde produced by the body itself, not a continual stream of formaldehyde coming in from the outside.