Ibutamoren, or MK 677, is a pure human growth hormone booster that positively influences the levels of IGF-1. As for its fitness profile, it enables a realistic rate of muscle production while increasing the volume of workouts. It chemically imitates the properties of ghrelin that fuels the production of HGH. With a higher level of HGH, you begin to experience a broad-spectrum of fitness effects, including fat loss and prevention from muscle loss. Ibutamoren, however, triggers side effects such as unusual appetite, hypo-pituitary desensitization, and hormonal imbalance. Moreover, the illegal SARM can also weaken the immune system, making your health susceptible to illnesses.