Folate for sperm quality

We recently began trying for our second and we have changed a lot since we got pregnant with our first. Last time it was an accident that involved the Dodger in the play offs for the World Series and way to much tequila... this time neither of us drink, we eat plenty of vegetables, workout, etc. I began taking a folate supplement and was reading that it is actually very good for the man to take as well to improve sperm quality etc.

my question is- is there such thing as to much? I know I need to keep my intake under 1000mg but would there be a negative affect if he took 1600mg? My current pills are 800mg each and they have B12 too.