It's that time of year when New Zealand men become hairier than usual - Movember is celebrating its 10th birthday.

This month, clean-shaven blokes will commit to growing a moustache for 30 days, to spark conversation and raise funds for prostate cancer, testicular cancer and mental health problems.

Organisers say more than 100-thousand moustaches have been grown to raise awareness for men's health, since the campaign's local launch in 2006.

Fresh from battling for the Rugby World Cup, Brodie Retallick will take on Movember this month, all in the name of men's health.

Brodie Retallick will attempt to be one of New Zealand’s tallest Mos this year.

The 2.04 metre tall lock has committed to growing his moustache for the cause, following in the footsteps of other famous rugby Mo Bros who have gone before him, including All Blacks captain and long time Mo Bro Richie McCaw.