Graviola (Soursop) for Immune Function

Research suggests that Graviola leaf extract may have immunomodulatory properties, with one laboratory study demonstrating enhanced macrophage immune function through MAP kinase pathway activation and cytokine upregulation, and a 2017 systematic review noting in vivo immunomodulatory activity among the plant's broader pharmacological effects. However, the evidence is notably mixed: a 2023 animal study found that Annona muricata leaf extract produced significant immunosuppression in rats, raising questions about whether the plant's immune effects are enhancing or inhibitory depending on context, dose, or preparation. The available body of evidence consists primarily of preclinical studies, including animal and cell-based research, with no human clinical trials identified among the reviewed literature. Studies indicate that while there is biological plausibility for immune-related activity, the contradictory directional findings and absence of human data make it premature to draw firm conclusions about Graviola's effects on immune function in people.