Quiets the Spirit and calms the Heart (An Shen) — palpitations, anxiety, insomnia, and nightmares from Heart Shen disturbance; one of the principal An Shen (Spirit-calming) drugs in the TCM pharmacopoeia alongside Long Gu (dragon bone), Zhen Zhu Mu (pearl), and Ci Shi (magnetite)
Activates Blood and dissolves Blood Stasis — amenorrhea, dysmenorrhea, post-partum Blood Stasis, and abdominal masses from Liver Blood Stasis; descending action of Liver channel herb reaches the lower abdomen
Promotes urination and dissolves Bladder Stagnation — dysuria, haematuria, urinary calculi (stones), and painful urinary strangury (lin); classical use for Blood Lin (bloody painful urination) and Stone Lin (urinary calculi)
Reduces swelling and heals wounds (external) — chronic non-healing ulcers and infected wounds; Hu Po powder dusted onto wound surfaces; traditionally combined with Long Gu in topical ulcer powder
Secondary Actions
Calms convulsions in children — febrile convulsions and epilepsy in children; Shen-calming and Liver-Wind-settling action; classical pairing with Zhu Sha (cinnabar) now avoided due to mercury toxicity — Hu Po used alone or with non-toxic alternatives
Clears Heart Fire — oral ulcers, tongue sores, and irritability from Heart Fire ascending; sweet-neutral nature clears without excessive cold injury
Classic Formulas
Hu Po Duo Mei Wan (琥珀多寐丸) — for insomnia, anxiety, and nightmares; Hu Po combined with Ren Shen, Long Yan Rou (longan), Dang Gui, Fu Ling, and Suan Zao Ren; restores Heart Blood and quiets Shen; classical formula still used in contemporary TCM for Heart Blood deficiency insomnia with anxiety
Hu Po San (琥珀散) — multiple classical versions; the urinary variant combines Hu Po with Mu Tong, Hua Shi (talcum), Che Qian Zi, and Deng Xin Cao for Blood Lin and Stone Lin; promotes urination and dissolves Bladder Stasis
An Shen Wan (安神丸) variant — Hu Po as one of several An Shen drugs combined with Zhen Zhu Mu, Long Gu, Bai Zi Ren, and He Huan Pi for composite Spirit-calming formula
Classical References
Ming Yi Bie Lu (Tao Hongjing, 500 CE): 'Hu Po is sweet, neutral — calms the Spirit, dispels nightmares, breaks Blood Stasis, promotes urination, dissolves Lin strangury — it is fossilised pine resin transformed by the earth over countless generations; enter it with Bao Mu (preserved wood)'
Ben Cao Gang Mu (Li Shizhen): 'Hu Po enters the Heart and Liver blood aspects — calms the Shen, breaks Blood, drains Lin strangury, reduces swellings; the name Hu Po (tiger + amber) may derive from folk belief that tiger spirit transforms into stone after death — or from the yellow-orange colour resembling tiger markings; genuine Hu Po should give a resinous pine aroma when touched with a hot needle and float in saturated salt solution'
MINERAL NOTE: Hu Po (琥珀) is fossilised tree resin (amber) — an organic-mineral drug, not a plant, though it is of botanical origin (ancient conifers). Commercial Hu Po comes principally from Baltic amber (succinite, 3–8% succinic acid) and Burmese amber (burmite). Widely adulterated with copal (young resin), synthetic resins, and plastics — verify by hot-needle test (pine-resin aroma), salt-water float test (density ~1.05–1.10 g/cm³), and UV fluorescence. Hu Po is always used as a powder or in pills — NEVER decocted (heat degrades the drug).
Communic acid and agathic acid (labdanoid diterpene acids) — characteristic of Baltic amber (succinite); antioxidant
Volatile sesquiterpene and diterpene hydrocarbons — aromatic compounds; anxiolytic effects in some studies
Phenolic compounds (amber-specific) — antioxidant; minor fraction in high-quality amber
Studied Effects
Succinic acid and anti-inflammatory activity: succinic acid from Baltic amber demonstrates anti-inflammatory effects in LPS-stimulated macrophage models, reducing IL-6 and TNF-α production; neuroprotective effects observed in oxidative stress models — provides a mechanistic basis for the traditional Spirit-calming and anti-inflammatory applications, though bioavailability of succinic acid from orally administered amber powder is not well-characterised
Anxiolytic and sedative: diterpene resin acids from amber interact with GABA-A receptor modulatory sites in preliminary in vitro studies; provides a plausible pharmacological mechanism for the classical Spirit-calming indication, though human clinical data on amber as a sedative is absent; pharmacological validation of the An Shen action remains preliminary
Succinic acid in metabolic medicine: exogenous succinic acid supplementation (as a pharmaceutical compound, not amber) improves mitochondrial function in hypoxic and post-ischaemic states; extrapolation of this effect to powdered amber ingestion is speculative given the different bioavailability profiles
Safety & Interactions
Contraindications
Yin Deficiency with hyperactive Fire — sweet-neutral with Blood-moving properties; the descending blood-activating action may aggravate restlessness in Yin Deficiency Fire patterns
No Stasis present — Blood-activating drugs inappropriate without Blood Stasis; avoid in pure deficiency patterns without stagnation
Cautions
Standard dose: 1.5–3 g as a powder taken with decoction (chong fu); NOT boiled in decoction — heat destroys amber; always added to the finished decoction or taken as pill/powder
Adulteration risk: Hu Po is among the most adulterated TCM minerals; copal (young resin) and synthetic amber are commonly substituted; copal has different chemistry and lacks succinic acid content; always source from verified TCM pharmacies with authentication testing
Authenticity test: genuine amber gives a characteristic pine-resin aroma when briefly touched with a hot needle; floats in saturated salt solution (density ~1.05–1.10 g/cm³); synthetic resin sinks or gives acrid plastic smell
Blood-activating caution: Hu Po activates Blood — use cautiously in patients with bleeding disorders or on anticoagulants; standard therapeutic doses are unlikely to cause significant haemostatic effects but monitor in high-risk patients