It is possible. In Traditional Korean Medicine, herbal medicine can address Spleen Deficiency (비허, 脾虛) and regulate Phlegm-Fluid (담음, 痰飮) and Dampness (습, 濕), improving water metabolism and digestion, which can naturally lead to weight changes. This is particularly helpful for those with poor appetite control or easy bloating. However, relying solely on herbal medicine without exercise has limitations. Basal metabolic rate is heavily influenced by muscle mass, and herbal medicine alone cannot build or maintain muscle. Moreover, during weight loss, both fat and muscle are lost; without exercise, muscle loss accelerates, increasing the risk of rebound weight gain and a less resilient constitution. The effects of herbal medicine also vary greatly by individual constitution and lifestyle. In TKM, prescriptions are tailored to one's constitution and pattern diagnosis (변증, 辨證). For those with both Phlegm-Fluid and Blood Stasis (어혈, 瘀血), herbal medicine alone may not break through plateaus. In conclusion, rather than asking if herbal medicine alone can work, the realistic answer is that combining herbal medicine with exercise provides much more stable and sustainable results. Think of herbal medicine as setting the foundation, while exercise builds the structure on top. I personally experienced frustration when I relied only on medicine without exercise, so now I always recommend exercise to my patients.