In the past few years, Branched Chain Amino Acid (BCAA) supplements have gradually used on different groups. From training athletes, maintaining functions of healthy elders to preventing disabilities of people that can't do intense exercises. BCAAs are now considered to be able to prevent muscle atrophy and strength loss, also possible to increase strength and muscle mass if combined with resistance exercises. Stroke patients have difficulties with moving, which led to multiple disabilities, are more likely to have sarcopenia and strength loss. Furthermore, reducing the will of moving or walking. Recently, studies showed that combined BCAAs with resistance exercises can effectively increase muscle mass, thus commonly used on training athletes.