The medicinal, environmental, and industrial uses of the green production of gold nanoparticles (AuNPs) have attracted much interest in recent years. This review aims to examine the significance of the green synthesis of AuNPs. Plant extracts, fungi, bacteria, and algae are all natural resources that may be used in the green synthesis of AuNPs. The synthesis of very stable and homogenous nanoparticles is achieved using these biogenic sources, reducing the environmental impact. Biogenic AuNPs are a promising alternative to chemically manufactured nanoparticles due to their claimed antimicrobial, antifungal, antioxidant, and anticancer effects. The green synthesis of AuNPs has used various biogenic sources, and this review study covers such sources and their features. The calming and stabilizing effects of plant extracts like aloe vera, green tea, and neem have been the subject of substantial research. The possibility of obtaining AuNPs from microorganisms, including bacteria, fungi, and algae, has also been investigated. We also discuss how pH, temperature, and reactant concentration all play a part in synthesizing AuNPs. This review study compares the catalytic activity of traditionally synthesized AuNPs with green-synthesized AuNPs based on significant research on the latter. It has been shown that green-synthesized AuNPs are more effective and efficient catalysts than their conventionally synthesized counterparts. Using biogenic sources also leads to the creation of more uniformly sized and stable nanoparticles. To sum up, the green synthesis of AuNPs is an exciting new direction in the environmentally responsible and long-term manufacture of nanoparticles with broad potential. Synthesizing extraordinarily stable and efficient nanoparticles from biogenic sources has several benefits, including a lower environmental impact. This reviews the present state of green synthesis of AuNPs and its significance for environmental awareness and concern.

Keywords: Green synthesis, gold nanoparticles, eco-friendly, sustainable, renewable resources, cost-effective, biocompatible, non-toxic, biomedical applications, drug delivery, imaging, stability, therapeutic properties, reduced toxicity, and implications.