Long Gu (Dragon Bone) (Os Draconis — fossil mineral)
What Is Long Gu (Dragon Bone)?
Long Gu (Dragon Bone) is catalogued in the Materia Medica under the binomial Os Draconis — fossil mineral. The material in circulation is fossil mineral. Long Gu (Dragon Bone) is the name in everyday use, while Os Draconis — fossil mineral is the name that identifies it unambiguously across languages, trade documents and safety literature. In the hand it reads as odorless, chalky — a practical marker of freshness and correct identification.
In Traditional Chinese Medicine, Long Gu (Dragon Bone) is a long-standing entry. It appears in the classical Chinese materia medica, where entries were organised by taste, temperature and the channels a substance was said to enter, and it has been carried forward through centuries of formula literature. Beyond its practical use it carries cultural associations — TCM: anchors floating Yang.
Today most searches for Long Gu (Dragon Bone) come from people reading about anxiety and bone health, or checking how it sits alongside a medication they already take. The use most often documented in the literature is TCM: calms the spirit, settles anxiety and palpitations, followed by astringent for sweating.
How Does Long Gu (Dragon Bone) Work?
Long Gu (Dragon Bone) works as a mixture rather than a single isolated compound, and its profile is usually described by the class of constituents present in fossil mineral rather than by one marker molecule.
Chinese medicine describes substances by temperature, flavour and channel entered, and rarely uses a plant alone — it is weighted inside a formula against other ingredients. That older description was arrived at without chemistry, and it does not map neatly onto constituent names — but it records centuries of observation about dose, preparation and who the plant suited.
Published research is sparse, so most of what is documented here comes from traditional use and preliminary laboratory work, and this profile cites 1 source. Reported findings centre on calcium carbonate and calcium phosphate (hydroxyapatite). Where research exists, it examines TCM: calms the spirit, settles anxiety and palpitations and astringent for sweating. These are areas of study, not established outcomes, and results differ by preparation and dose.
How the plant is prepared changes what you actually get. Its constituents move readily into water and alcohol — so a preparation made in another medium will not carry the same fraction of the plant, which is why traditional recipes specify one over another.
Long Gu (Dragon Bone) is studied as a whole preparation because isolating one fraction tends to behave differently from the material it was taken out of — a recurring finding across the plant-chemistry literature.
Because these constituents are processed by the same pathways that handle many medicines, Long Gu (Dragon Bone) is documented as interacting with antibiotics, thyroid medications. That is a question of shared metabolism rather than of potency, and it is the main reason the plant is listed in interaction references at all.
Dose, plant part and growing conditions all shift the constituent profile, so two products carrying the name Long Gu (Dragon Bone) can differ substantially; this is why reference entries specify fossil mineral and, where they exist, standardisation markers.