Sha Yuan Zi (Astragalus Seed, Flattened Milkvetch Seed)

Chinese Herb Actions

Chinese Herb Dosage

• What is the typical dosage of Sha Yuan Zi?

  Commonly 9–15 g in decoction (some sources give 6–12 g), usually as one component of a Kidney-tonifying or essence-securing formula rather than taken alone. It is frequently salt-processed (yán zhì, 盐炙) — stir-fried with salt water — a standard preparation said to guide the herb more strongly into the Kidney and enhance its astringent, essence-securing action.

  Source: materia medica consensus (Bensky; Chen & Chen); standard TCM processing (pao zhi) references. Reference only — not a prescription.

Chinese Herb Combinations:

Chinese Herb Contraindications & Cautions

• Are there cautions for Sha Yuan Zi?

  Sha Yuan Zi is traditionally avoided in patterns of Kidney-yin deficiency with heat (“fire”) and in damp-heat of the lower burner. Because it is warming, it is not the choice for dream-disturbed seminal emission or other patterns with heat signs such as night sweats and a flushed complexion — a yin-nourishing, fire-clearing strategy is used instead. Because it is astringent, it is also avoided where damp-heat is present (e.g. turbid, painful, or difficult urination), since binding therapy risks trapping a pathogen inside.

  Source: materia medica consensus (Bensky; Chen & Chen) — standard cautions for Kidney-tonifying, essence-securing astringents. Reference only, not medical advice.

Chinese Herb Toxicity & Overdose

• Low. A 2014 phytochemical/pharmacological review of Semen Astragali Complanati describes minimal or negligible toxicity across the studies it surveyed, and no significant toxic reactions are documented in classical or modern clinical use at standard doses.

  Source: PMID 24933224 (review); materia medica consensus. Reference note, not a safety guarantee.

Herb-Drug Interactions

• No well-established clinical herb–drug interactions are documented. Preclinical (animal) research has found cholesterol-lowering and antioxidant effects for Astragalus complanatus seed extract, so practitioner awareness is reasonable for patients on lipid-lowering or antihypertensive medication — this is precautionary, based on preclinical findings, not a demonstrated clinical interaction. (Flagged for practitioner confirmation.)

Western / Biomedical Research

Chinese Herb Clinical Studies & Research

Provided as research context — a summary of published biomedical study, not a therapeutic or medical claim.

• Is there modern research on Sha Yuan Zi (Astragalus complanatus)?

  Yes — preclinical (cell and animal) research supports several traditional actions, but there are no robust human clinical trials on the seed itself. This research is specific to Astragalus complanatus seed and should not be confused with the separate, larger research base on Huang Qi (Astragalus membranaceus root), a different species with different traditional uses.

  • Bone formation (animal, preclinical) — in ovariectomized rats, a Semen Astragali Complanati decoction increased trabecular bone volume and reversed ovariectomy-induced bone loss, performing comparably to a positive-control estrogen drug; the proposed mechanism was stimulating osteoprotegerin (OPG) and downregulating RANKL in osteoblasts and bone marrow stromal cells. Animal model; the authors note the active components were not yet isolated, so clinical translation is unestablished.
  • Liver fibrosis (animal, preclinical) — in rats with dimethylnitrosamine-induced hepatic fibrosis, an Astragalus complanatus flavonoid extract reduced markers of collagen synthesis and lipid peroxidation (raising antioxidant enzyme activity, lowering malondialdehyde) at doses of 30–120 mg/kg. Animal model, not clinical evidence.
  • Anti-inflammatory (in vitro) — complanatuside, a flavonol glycoside isolated from the seed, protected cultured human skin keratinocytes from cytokine-induced (IFN-γ/TNF-α/IL-6) inflammatory damage and suppressed pyroptosis markers in a 2022 cell-culture study. Laboratory finding, not a therapeutic claim.
  • Cholesterol-lowering (animal, preclinical) — in rats fed a high-cholesterol diet, Astragali Complanati Semen extract (600 mg/kg/day) reduced elevated cholesterol, with metabolomic analysis pointing to upregulation of hepatic PPARα and enhanced fatty-acid oxidation as a possible mechanism.
  • Phytochemistry — the seed's antioxidant capacity has been measured directly, with twelve phenolic compounds (chiefly flavonoids such as complanatuside) tentatively identified by UPLC-Q-TOF mass spectrometry.

  Note: we found no dedicated pharmacological research on Sha Yuan Zi's traditional “brightens the eyes” / vision-related use specifically for this species; that indication remains a traditional-use claim only, not a research-supported one.

  Sources: PMID 24933224, DOI 10.1016/j.jep.2014.06.013 (ethnopharmacological/phytochemical/pharmacological review); PMID 23782721, PMC 3699375 (bone formation, ovariectomized rat model); PMID 16270385, PMC 4479676 (anti-liver fibrosis, rat model); PMID 36034662 (complanatuside, keratinocyte cell culture); PMID 28753987, PMC 5618085 (hypocholesterolemic effect, rat model); PMID 23790916 (phenolic extraction/antioxidant capacity). Research context, not a therapeutic claim.

Chinese Herb Notes

• How is Sha Yuan Zi different from Huang Qi (both called “Astragalus”)? What are its key combinations?

  Sha Yuan Zi and Huang Qi share only the genus Astragalus — they are different species and different parts of the plant, with unrelated TCM actions. Huang Qi (Radix Astragali) is the root of Astragalus membranaceus, a Spleen/Lung qi tonic that raises yang, strengthens wei qi, and promotes healing. Sha Yuan Zi (Semen Astragali Complanati) is the seed of Astragalus complanatus, entering Liver and Kidney to tonify essence and astringe. English retail listings that simply say “Astragalus” can conflate the two; the Chinese names (Huang Qi vs. Sha Yuan Zi) and the plant part (root vs. seed) are the reliable way to tell them apart.

  • Chief herb in Jin Suo Gu Jing Wan (Metal Lock Pill to Stabilize the Essence) — combined with Qian Shi, Lian Zi, Long Gu, and Mu Li to secure Kidney qi that has failed to “hold the gate,” for non-dream-disturbed spermatorrhea and premature ejaculation.
  • With Tu Si Zi — both are seeds that tonify Kidney essence and benefit the eyes and are frequently paired; Tu Si Zi leans more broadly yang-warming (and is also used for threatened miscarriage), while Sha Yuan Zi’s distinguishing strength is its astringent, essence-securing action.
  • For blurred vision and dizziness — traditionally combined with other Liver/Kidney vision herbs such as Gou Qi Zi and Ju Hua.

  Source: materia medica consensus (Bensky; Chen & Chen); Sacred Lotus Sacred Lotus sources & references for Jin Suo Gu Jing Wan.