INS and metabolic syndrome: Dietary SM supplementation reduced insulin level [MD: -0.63; 95% CI (-0.96, -0.31), <i>p</i> = 0.0001] and HOMA-IR [MD: -0.23; 95% CI (-0.31, -0.16), <i>p</i> < 0.00001] without affecting blood levels of glucose and inflammatory cytokines.<h4>Conclusion</h4>Overall, dietary SM supplementation had a protective effect on blood lipid profiles and insulin level, but had limited impacts on other metabolic parameters in adults without MetS.