Microcystin-LA is primarily known for its role in environmental and health-related studies due to its toxicity. It is often monitored in water bodies to assess the risk of harmful algal blooms, which can produce this toxin. In research, it is used to study the effects of cyanotoxins on liver function, as it is a potent hepatotoxin. Additionally, it serves as a reference standard in analytical methods for detecting and quantifying microcystins in water samples, ensuring public health safety. Its presence in aquatic ecosystems is a significant concern for drinking water quality and the health of aquatic organisms.