"It's good to help other people," said Mr Lelen.
"It's a simple and direct thing to do. It's not like a charity where you don't know where your money's going."
The biggest use of blood products is for the treatment of cancer at 22 per cent, with the next biggest being accidents at 8 per cent. Blood required for mothers and babies makes up 7 per cent.
Jeff Maurice, who works for the Marsden Point oil refinery, says he just likes to do it.
"I just like to help other people whenever I can."
Julie Wood, a nurse from North Haven Hospice, said it was the twentieth time she had given blood.
The NZ Blood mobile collection team will be at the Northland Cricket Association from 9am to 3pm today and at the St John Ambulance building in Ruakaka from 8.30am to 1pm tomorrow.