MK-677 is also valued for its potential anti-aging properties. It has been shown to improve skin elasticity, which can help reduce the appearance of wrinkles and promote a more youthful appearance. Additionally, many users report increased energy and vitality, contributing to overall well-being. Another benefit of MK-677 is its impact on sleep quality. Studies suggest it improves REM sleep, which is essential for cognitive recovery and brain health. Many users experience improved cognitive function, including better concentration, memory, and clarity of thought. One of the most common side effects is an increased appetite, which can make it difficult for some people to control their eating. Water retention is another possible side effect, often resulting in temporary bloating. Some users also report fatigue, particularly when taking high doses or during the initial adaptation phase. Although rare, MK-677 can cause insulin sensitivity issues, which affect how the body processes blood sugar.