Poly-L-glutamic acid sodium salt is widely used in the cosmetics industry as a highly effective moisturizing agent. It helps retain water in the skin, improving hydration and elasticity, making it a key ingredient in anti-aging and skincare products.

In the pharmaceutical field, it serves as a drug delivery carrier due to its biocompatibility and ability to enhance the solubility and stability of therapeutic compounds. It is also studied for applications in controlled drug delivery and wound healing.

Additionally, it is utilized in the food industry as a thickener, stabilizer, and emulsifier, improving texture and shelf life of various products.

In agriculture, it acts as a plant growth stimulant and enhances the efficiency of fertilizers by improving water retention and nutrient uptake.

Its biodegradable nature also makes it an eco-friendly alternative in industrial applications, such as water treatment and biodegradable plastics.