The National Bowel Cancer Screening Program is getting a $10 million campaign injection to urge more Australians to participate in testing.

While the at-home test is free for Australians aged 50 to 74, only 40 per cent of those eligible are participating.

Cancer Council Director of Cancer Prevention and Advocacy Anita Dessaix says the test has potential to save thousands of lives, but more people need to take part.