Fossilized Bone Pieces (Fossilia Ossis Mastodi), known in Traditional Chinese Medicine as Long Gu (龙骨), are dense, mineral-rich fragments traditionally used to calm the spirit, anchor the yang, and astringe fluids. Sourced from ancient fossilized animal bones, these pieces are carefully prepared and cleaned to preserve their natural mineral content and grounding energetic properties. In TCM, Long Gu is used to address conditions involving restlessness, anxiety, insomnia, palpitations, or dream-disturbed sleep, particularly when caused by yin deficiency or floating yang. It is also employed to help stabilize the emotions, support recovery from trauma, and reduce leakage of fluids, such as spontaneous sweating, night sweats, or seminal emissions. Additionally, it is sometimes used topically to promote tissue regeneration and heal chronic sores. When decocted, Fossilized Bone is typically simmered for a longer duration and often added at the beginning of a formula. It is frequently paired with herbs like Mu Li (Oyster Shell), Suan Zao Ren (Zizyphus Seed), or Bai Zi Ren (Biota Seed) to enhance its spirit-calming and astringent effects. Each batch of Fossilized Bone Pieces (Fossilia Ossis Mastodi) is carefully selected and processed to ensure purity, safety, and traditional potency. Whether used in calming formulas, sleep support blends, or astringent preparations, Long Gu provides a time-tested, deeply grounding herb for restoring internal balance and emotional stability. Note: To maximize absorption and reduce heaviness in formulas, fossilized bone is often used in calcined or pre-cooked form, especially when taken internally. Always use under the guidance of a qualified practitioner.