Hai Zao Wan - Seaweed Extract | Best Chinese Medicines. This formula is designed to disperse phlegm, reduce swelling, and soften and reduce masses and lumps. It is often used to reduce phlegm type (soft or rubbery and well defined) masses, nodules and lumps. This is the most frequently used formula for benign masses in the neck, such as thyroid nodules and goiter. It can also be helpful for breast cysts, adenomas, lipomas, sebaceous (fatty) cysts, ovarian cysts, fibroids, etc.