Bioaccumulation and biomagnification are critical processes driving the persistence and amplification of toxic metals in the biosphere. Anthropological activities like mechanization, agriculture, as well as mining contribute to widespread presence concerning toxicological metals. These non-biodegradable metals accumulate in organisms through bioaccumulation, where they are absorbed faster than they can be metabolized or excreted, leading to toxic levels in tissues, for instance, the kidneys and muscles. Over time, this process impairs affected species’ metabolic functions, growth, and reproduction. Biomagnification amplifies these toxic effects as metals become more concentrated at higher trophic levels. Predators consuming contaminated prey ingest larger concentrations of these metals, leading to severe consequences for top predators, including humans. For example, mercury in aquatic ecosystems is absorbed by small organisms and then transferred up the food chain, affecting fish, birds, and mammals. Lead, cadmium, and arsenic have similar disruptive effects on biological systems, including neurological damage, anemia, kidney dysfunction, and cancer. The ecological impact is profound, as toxic metal contamination disrupts food webs, leading to population declines in top predators and destabilizing biodiversity. This chapter also highlights the significant health risks to humans, particularly in communities that rely on contaminated resources. Neurological disorders, cancer, and developmental issues in children are among the many concerns associated with toxic metal exposure. To address these cascading effects, the chapter calls for stronger environmental regulations, enhanced monitoring, and innovative remediation strategies to detoxify contaminated ecosystems, thereby protecting both biodiversity and human health.