A lot of people use m-stak as a bulking agent and m-stak boasts itself as the muscle-builder for hardgainers. But I noticed m-stak not only contains the leucine complex which is great, and the stimulant complex for enhanced energy which is great for hardcore training, but it also contains the adaptogen complex. I was reading an article about supplementing for powerlifting and adaptogens were ranked with protein powder, creatine and a pre-workout supp (which m-stak already is!) as the most important ones. The stress that heavy lifting puts on your muscles, joints, ligaments and nervous system is very impactful and adaptogens help you recover.
Adaptogens can help increase focus, enhance energy, lower anxiety, increase strength and improve stamina in the gym which obviously you can figure out will lead to heavier lifts.
Not just the hardgainers mass increaser, m-stak can help even the most jacked powerlifters add weight to the bar as well.