Researchers used lion's mane mushroom extract (Hericium erinaceus) to synthesize tiny silver-copper nanoparticles (9.3 nm) that showed stronger antibacterial and anticancer activity than the extract alone. Against S. aureus bacteria, the nanoparticles created 14.89 mm inhibition zones, while demonstrating 3.9-fold greater toxicity toward colon cancer cells compared to normal fibroblasts, indicating selectivity for cancer cells. This green synthesis approach uses only mushroom extract with no toxic chemicals, positioning these nanoparticles as potential antimicrobial and anticancer agents for biomedical applications.