This study deals with the relationship between social support and mental health. This relationship was conceptualized as a multi-faceted one which may be understood in terms of direct (main), protective (buffering) and compensatory effects. Hypotheses relating to these effects were evaluated in terms of spousal/community support and job strains (pressure, autonomy, opportunities) among a sample of 455 married males who were employed on a full-time basis. Results indicated that spousal support generally had more important implications for psychological well-being than did community support. However, the relative impact of these different sources of support appeared to be related to the degree to which the mental health symptomology reported was affectively defined. With respect to protective effects, spousal support was found to moderate the relationship between certain job strains (pressure) and mental health. No protective effects were found for community support. Tests of the hypothesis that community support compensates for low levels of spousal support were made in terms of both direct and protective effects. No direct effect compensation was observed. However, protective effect compensation was observed for certain job strains (opportunities) and was relevant to a wide range of symptomology. The overall results suggest a primary/secondary hierarchy of supports and strains in which primary supports (e.g. spousal) assume a protective function with respect to secondary strains (e.g. job) while secondary supports (e.g. community) do not protect individuals from primary strains (e.g. spousal). Secondary supports have a protective function for secondary strains in the absence of primary supports. It is further suggested that sex roles may be important determinants of the availability and use of different support sources.