Metformin is one of the most widely prescribed medications in the world, primarily used to manage type 2 diabetes and, in some cases, gestational diabetes and polycystic ovary syndrome (PCOS). It works by improving how the body responds to insulin, helping to lower blood sugar levels effectively. While it has been used for more than six decades, scientists are still uncovering new ways it may affect the body. Recent research suggests that metformin may also play a role in the brain, particularly in an area called the hypothalamus, which helps regulate metabolism. Studies in mice indicate that the drug may switch off a protein linked to glucose control, highlighting a potential brain-based mechanism behind its benefits.

These findings could open the door to new treatments not only for diabetes but possibly for broader health concerns, including aspects of brain aging. However, more research is needed to confirm these effects in humans. Like most medications, metformin can cause side effects. Common ones include nausea, diarrhea, stomach discomfort, reduced appetite, and a metallic taste in the mouth. In some cases, long-term use may lead to vitamin B12 deficiency, which can cause fatigue and other symptoms. While serious side effects are rare, it is important for individuals to use the medication under medical supervision and seek professional advice if unusual symptoms occur.