Final answer:
The World Health Organization (WHO) helps inform healthcare decisions through systemic reviews and promotes better healthcare by working with organizations around the world.
Step-by-step explanation:
An international organization that aims to help people make well-informed decisions about healthcare by preparing, maintaining, and promoting the accessibility of systemic reviews of healthcare interventions is the World Health Organization (WHO). The WHO, which is a specialized agency under the United Nations, plays a crucial role in providing leadership on matters critical to health, shaping the health research agenda, and monitoring global health trends. Working with various organizations around the world, its efforts contribute to bringing down the cost of healthcare and increasing the quality of care provided to people globally.