Quiets the Spirit and calms the Heart (An Shen) — palpitations, anxiety, insomnia, and nightmares from Heart Shen disturbance; Xi Hu Po (Western/Baltic amber) was historically regarded as the highest-quality grade of amber in Chinese TCM, imported via Silk Road trade; same principal Spirit-calming actions as domestic Hu Po (herb #98)
Activates Blood and dissolves Blood Stasis — amenorrhea, dysmenorrhea, and Blood Stasis in the Liver channel; descending Blood-moving action reaches the lower jiao
Promotes urination and dissolves Bladder Stagnation — dysuria, haematuria, and urinary Lin strangury; classical use for Blood Lin and Stone Lin patterns
Secondary Actions
Higher-grade Spirit-calming tonic — Xi (西, Western/Occidental) designates Baltic amber imported via Central Asia or Canton trade routes; Chinese physicians regarded imported Baltic amber as superior in medicinal potency to domestic amber from Yunnan or Liaoning; the same TCM indications apply but quality-conscious formulators preferred Xi Hu Po for severe or refractory Shen disturbances
Topical wound-healing — dusted as powder onto chronic non-healing ulcers and infected wounds; same external application as Hu Po
Classic Formulas
Xi Hu Po An Shen Wan variant — high-grade insomnia and palpitation formula specifying Xi Hu Po rather than generic Hu Po; combined with Suan Zao Ren, Long Yan Rou, Ren Shen, and Fu Ling; in contemporary practice the Xi/domestic distinction is rarely made as authentic Baltic amber of historical quality is difficult to source
Hu Po San (琥珀散) — urinary strangury formula; Xi Hu Po used interchangeably with Hu Po in this formula; see herb #98 for formula details
Classical References
Ben Cao Gang Mu (Li Shizhen): distinguishes several grades of Hu Po — 'Xi Hu Po (western amber) is imported from the Western Ocean via Guangdong; golden-yellow, transparent, and of larger crystal size; regarded as the best medicinal grade — the same properties as domestic Hu Po but greater potency; domestic amber from Yunnan and Guangxi is of lower grade'
PROVENANCE NOTE: Xi Hu Po (西琥珀, 'Western amber') designates Baltic or Middle Eastern amber imported into China via Silk Road trade routes, historically arriving through Central Asia or via Canton (Guangzhou) maritime trade; Baltic amber (succinite, from the Baltic Sea region of northern Europe) has a higher succinic acid content (3–8%) and different resin acid profile than Southeast Asian and Chinese domestic ambers; the XLSX source filed two entries for Succinus — Hu Po (#98, domestic) and Xi Hu Po (#99, Western/imported grade); in modern TCM pharmacy the distinction is rarely observed in clinical dispensing.
Modern Research
Active Compounds
Succinic acid (amber acid) — higher concentration in Baltic amber (succinite) vs some domestic amber varieties; 3–8% content in authentic Baltic succinite
Abietic acid, communic acid, and agathic acid (diterpenoid resin acids) — characteristic of Baltic succinite; anti-inflammatory
Phenolic antioxidants — minor fraction; antioxidant activity
Studied Effects
Baltic amber succinic acid: succinic acid content has been better characterised in Baltic amber than in many domestic Chinese amber sources; anti-inflammatory and neuroprotective effects of succinic acid are documented in cell models; the higher succinic acid content of Baltic succinite may partially explain the historical TCM preference for Xi Hu Po over domestic amber for Shen-calming applications
Identical pharmacological profile to Hu Po (#98): same drug substance (Succinus), same active compound classes, same studied effects — see herb #98 for complete research summary
Safety & Interactions
Contraindications
Yin Deficiency with hyperactive Fire — Blood-activating properties may aggravate restlessness
No Blood Stasis present — Blood-moving drugs inappropriate in pure deficiency patterns without stagnation
Cautions
Standard dose: 1.5–3 g powder taken with decoction; NOT decocted — heat degrades amber; always chong fu (add to finished liquid)
Adulteration is severe: Xi Hu Po labelling is particularly prone to fraud given the premium price; copal, synthetic amber, and ordinary domestic amber are frequently sold as Xi Hu Po; verify by hot-needle test (pine-resin aroma), density test (floats in saturated brine ~1.05–1.10 g/cm³), and UV fluorescence (Baltic amber fluoresces blue under UV; copal fluoresces differently)
See Hu Po (herb #98) for full safety profile — identical drug substance