Probiotics as a Natural Defense Against Lead Toxicity: A Comprehensive Review

The toxic, persistent, and non-biodegradable nature of heavy metal contamination, particularly lead (Pb), poses significant threats to environmental sustainability and public health worldwide. Lead exposure is associated with multisystemic toxicity, including hepatotoxicity, nephrotoxicity, neurotoxicity, reproductive dysfunction, and haematological abnormalities. Additionally, it disrupts immune homeostasis and alters the composition of the gut microbiota, further exacerbating systemic health complications. Although conventional chelation therapies remain the primary treatment for lead poisoning, their clinical application is often limited by adverse side effects, high cost, and restricted accessibility, especially in resource-limited settings. In recent years, probiotics, defined as live microorganisms that confer health benefits to the host when administered in adequate amounts, have emerged as a promising, natural, and cost-effective alternative for mitigating lead toxicity. Probiotic strains belonging to the genera Lactobacillus, Bifidobacterium, and Streptococcus exhibited significant potential to mitigate lead-induced toxicity through mechanisms such as biosorption and metabolic detoxification. Beyond metal binding, probiotics contribute to strengthening intestinal barrier integrity, enhancing antioxidant defence systems, modulating inflammatory pathways, and restoring gut microbial balance. Experimental evidence from in vitro and in vivo studies demonstrates that probiotics can effectively attenuate lead-induced oxidative stress, organ damage, and neurobehavioural impairments. This review comprehensively examines the current understanding of probiotic-mediated detoxification mechanisms, with particular emphasis on their antioxidant, immunomodulatory, and gut-protective roles. Overall, probiotics represent a safe, accessible, and sustainable therapeutic strategy for populations at risk of chronic lead exposure, highlighting their potential integration into future preventive and clinical interventions.