"It's quite high in tryptophan which doesn't mix well with longevity.
Unless you are a growing child or a bodybuilder you have better stay
off it.  For tryptophan see e.g. this assay by Ray Peat:"

http://raypeat.com/articles/aging/tryptophan-serotonin-aging.shtml

But it is not an optional protein that can be produced internally and
the question is how much is too much.  As in any biological process
there are minimal and optimal and maximal levels involved.  Min to have
some effect at all, opt the level where best results are achieved and
max where no additional increase prodeces additional desired effects and
begin to prompt undesired effects.  Here is another look from another
perspective:

http://www.tinnitusformula.com/infocenter/articles/treatments/trypto.aspx