1,1-Dimethylthiourea is primarily used as a reducing agent in various chemical processes, particularly in the polymerization of acrylic monomers. It helps in controlling the reaction rate and improving the quality of the final polymer product.

In the field of photography, it serves as a stabilizer for developing solutions, ensuring consistent image quality and extending the life of the developing agents.

Additionally, it is employed in the synthesis of pharmaceuticals and agrochemicals, where it acts as an intermediate in the production of active ingredients. Its ability to act as a scavenger for free radicals makes it useful in protecting materials from oxidative degradation, particularly in rubber and plastic industries.

In research laboratories, it is utilized as a reagent in organic synthesis, aiding in the formation of complex molecules through various chemical reactions. Its versatility and effectiveness in these applications make it a valuable compound in multiple industries.