This title is not the title of the study.
"Associations of regular glucosamine use with all-cause and cause-specific mortality: a large prospective cohort study"
This does not mean it reduces all cause mortality. This is correlation, not causation.
To take this further, there might be no limit to what you could correlate to some degree with all-cause mortality, especially since it might be heavily correlated to financial status, which would correlate to an enormous amount of other behaviors (eating avocados, owning a swimming pool, having a high ceiling, having your own bathroom, having a gym membership, organic food, name brand laundry soap, not taking public transportation, better healthy insurance, smoking habits, coffee quality, living in a low crime area, etc etc). Determining cause and effect takes a lot of control variables.
"Associations of regular glucosamine use with all-cause and cause-specific mortality: a large prospective cohort study"
This does not mean it reduces all cause mortality. This is correlation, not causation.
To take this further, there might be no limit to what you could correlate to some degree with all-cause mortality, especially since it might be heavily correlated to financial status, which would correlate to an enormous amount of other behaviors (eating avocados, owning a swimming pool, having a high ceiling, having your own bathroom, having a gym membership, organic food, name brand laundry soap, not taking public transportation, better healthy insurance, smoking habits, coffee quality, living in a low crime area, etc etc). Determining cause and effect takes a lot of control variables.