Oyster Shell Powder (Ostrea spp.), known as Mu Li (牡蛎) in Traditional Chinese Medicine (TCM), is a finely milled, mineral-rich powder traditionally used to calm the spirit, anchor yang, soften hardness, and support yin and fluid balance. Sourced from cleaned and dried natural oyster shells, this powder retains its high calcium carbonate content along with trace minerals, making it a valued ingredient in both herbal and nutritional applications. In TCM, Mu Li powder is commonly used to address symptoms related to yin deficiency and internal heat, such as restlessness, insomnia, irritability, night sweats, spontaneous sweating, or dizziness. It is also used to help soften masses and nodules and support bone strength, tissue repair, and mineral balance. Its nature is cool, salty, and astringent, making it especially effective for anchoring floating yang and stabilizing the body's foundational systems. This powdered form offers convenience and versatility for incorporation into capsules, pastes, herbal pills, or traditional decoctions—though when used in teas, it is often pre-cooked or simmered separately, as the dense mineral content does not easily dissolve. Each batch of Oyster Shell Powder (Ostrea spp.) is carefully prepared to ensure purity, consistency, and therapeutic value. Whether used as part of a calming and nourishing herbal formula or for its natural mineral support, this time-honored remedy provides a gentle, grounding way to restore internal balance, calm the mind, and support long-term wellness.