Healing with Herbs Herbal Therapies for Disease Prevention and Treatment

Cancer remains one of the leading global health challenges, with high morbidity and mortality rates despite
advances in conventional therapies. The limitations of current treatments, including toxicity, resistance, and
incomplete efficacy, have driven interest in natural compounds as complementary and preventive strategies.
Curcuma longa (turmeric) and Azadirachta indica (neem) are two medicinal plants with well-documented
anticancer properties. Their bioactive constituents—including curcuminoids, turmerones, and limonoids such as
nimbolide—exert pleiotropic effects across multiple stages of carcinogenesis. It has been shown to play a role in
promoting apoptosis and inhibiting angiogenesis, as well as enhancing immune surveillance. Crucially, the
phytochemical collaboration of turmeric with neem provides a site-independent strategy to combat tumor
heterogeneity and acquired resistance. Recent approaches in formulation science (nanocarriers, co-delivery systems
and bioenhancers including piperine) had contributed towards improved the bioavailability and therapeutic efficacy
of these phytochemicals. Preclinical and preliminary clinical data indicate that they are safe and effective, but there
are translational barriers in the standardization, regulatory approval processes and large-scale clinical testing. This
chapter provides a comprehensive overview of the molecular mechanisms, preclinical and clinical evidence,
formulations strategies, and future perspectives for the exploitation of the synergistic anticancer potential of
Curcuma longa and Azadirachta indica as environmentally sustainable multistage oncopreventive agents.