I always assumed that the water packaged with can beans would have tons of lectin seeped from the beans and therefore should be discarded. Is it safe to use?
As a normal human digestive tract does not contain any anti-oligosaccharide enzymes, consumed oligosaccharides are typically digested by bacteria in the large intestine. This digestion process produces gases such as methane as a byproduct, which are then released as flatulence.
Processing the beans, such as by boiling, soaking, cooking, can leach the indigestible sugars from the beans and significantly reduce, if not entirely eliminate the problem.
Also, red beans contain 3x as much of the foul stuff.