The research was done by Professor Dan Brockington of the University of Manchester and Professor Spensor Henson of the University of Sussex.
"Our survey found that while awareness of major non-government organisations' brands was high, awareness of celebrity advocates for those brands was low," the professors wrote in their article, published in the International Journal of Cultural Studies.
"Instead it was plain from the focus groups that most people supported the charities because of personal connections in their lives and families which made these causes important.
"The evidence suggests that the ability of celebrity advocacy to reach people is limited."
In separate research, Dr Martin Scott of the University of East Anglia analysed British people's perceptions of developing countries by asking them to record their exposure to information about poor nations.
Celebrity involvement in humanitarian causes was rarely mentioned by the volunteers.
"Overall, the results of this research suggest that celebrities are generally ineffective in cultivating a cosmopolitan engagement with distant suffering," Dr Scott said.
- Independent