Nutrobal or MK 677 is a powerful sarms developed by SARMs1. It’s one of the most versatile sarms out there to help boosting your overall athletic performance. It’s debatable whether MK-677 can be called a SARM as ultimately, it’s a growth hormone secretagogue which are normally used for enhancing GH in the body. SARMs are research chemicals but secretagogue is a natural substance. When it was first developed, MK677 was studied mostly for medical applications in osteoporosis, obesity and muscle wasting diseases related treatments. It’s by chance that the scientists have discovered its special capacity in building lean muscle mass in the process.