"has been life saving" is correct and usable in written English.
You can use it to emphasize the importance of something that has had a positive impact on your life. For example, "This book has been life saving to me - it gave me the courage to make a big career change."
Antimicrobials have been life saving on a broad scale, and non-prescription use may have certainly enabled wide access in these settings.
The idea of books as my own set of secret worlds has been life-saving more than once since Nicola Morgan, author of The Teenage Guide to Stress and Blame My Brain I Can Jump Puddles by Alan Marshall was a book I read over and over as it made me put my own trivial worries in perspective.
As the slideshow below shows, some of these interventions have failed -- but others have been life-saving.
The humanitarian response has been life-saving and heroic.
The doctors emphasize that the problem appears to be rare for a class of drug that clearly prevents fractures and has been life-saving for women with severe osteoporosis.
Although mobile phone use has proved to be life saving in certain circumstances (e.g., after accidents) and has helped improve the quality of life in some sectors, concerns continue to be raised about potential adverse health impacts associated with their use.
Whereas BMC was losing millions a year under the old contracts, this new strategy has proven to be life saving for the hospital.
Although these devices have proved to be life saving in certain circumstances (e.g., after accidents) and helped improve the quality of life in some sectors, concerns continue to be raised about potential adverse health impacts associated with their use.
First, many trials performed in critical care medicine involve experimental treatments that have the potential to be life saving.
The concept of clinical equipoise is less convincing, however, when it is used to justify the randomization of treatments that have the potential to be life saving.
