Guanine is widely used in the cosmetics industry, particularly in nail polish and shampoos, to provide a shimmering or pearlescent effect. It is also utilized in the production of certain types of makeup, such as eyeshadows and lipsticks, to enhance their visual appeal.

In the field of molecular biology, guanine is a crucial component of nucleic acids, playing a vital role in the structure of DNA and RNA. It is involved in the encoding, transmission, and expression of genetic information, making it essential for research in genetics and biotechnology.

Additionally, guanine is used in the development of fluorescent markers and dyes, which are important tools in various scientific studies, including cellular imaging and diagnostic assays. Its ability to absorb and emit light makes it valuable in these applications.

In the pharmaceutical industry, guanine derivatives are explored for their potential therapeutic properties, particularly in the development of antiviral and anticancer drugs. Research continues to investigate its efficacy in targeting specific diseases.