Ligustilide (Phthalide Terpenoid · Vasodilatory · Smooth Muscle Relaxant)

Compound	Ligustilide
Chemical class	Phthalide — Cyclic Lactone Terpenoid
CAS	4431-01-0
Primary source	Angelica sinensis (Dong Quai / female ginseng), Ligusticum chuanxiong (Chuan Xiong)
Key applications	Vasodilatory, neuroprotective, smooth muscle relaxant, gynaecological
Claim strength	Moderate
Typical form	Dong Quai extract standardised to ligustilide (1%)
Buy from Herbuno	Dong Quai Extract Powder → Ligustilide 1% Powder (Dong Quai Extract) | Standardized Angelica sinensis →

Commercial source: Ligustilide is commercially available as a standardised constituent of Angelica sinensis (Dong Quai) root extract at 1% ligustilide by HPLC, and as a component of Dong Quai dry extract powder. See sourcing options below. Traditional use: Dong Quai (Angelica sinensis, Dang Gui in TCM) has been used for over 2,000 years as the primary TCM herb for female gynaecological conditions — prescribed for dysmenorrhoea, irregular menstruation, amenorrhoea, postpartum recovery, and menopausal symptoms. It is often called “female ginseng.” Ligustilide is identified as the primary volatile phthalide responsible for Dong Quai’s pharmacological activity, particularly vasodilatory and smooth muscle effects. Research trajectory: Ligustilide has dedicated research for vasodilatory mechanism (calcium channel antagonism, eNOS activation), neuroprotective activity in ischaemia models, smooth muscle relaxant effects (relevant to uterine cramping), and anti-inflammatory properties. It is also present in Chuan Xiong (Ligusticum chuanxiong), the TCM herb used for headache and cardiovascular complaints. See sourcing options below.

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Evidence for Ligustilide Applications

Vasodilatory and cardiovascular: Ligustilide relaxes vascular smooth muscle via calcium channel (L-type) antagonism and eNOS-mediated NO production. In animal models, it reduces blood pressure and improves cerebral blood flow. TCM clinical studies of Dang Gui preparations demonstrate cardiovascular benefit in menstrual irregularity and post-MI recovery contexts, partly attributed to ligustilide. Claim strength: Moderate.

Smooth muscle relaxant (uterine and respiratory): Ligustilide relaxes uterine smooth muscle in a biphasic manner — initial stimulation followed by sustained relaxation — consistent with Dong Quai’s traditional use for both stimulating menstrual flow and relieving dysmenorrhoea (uterine cramping). Bronchial smooth muscle relaxation is also documented, supporting respiratory application. Claim strength: Moderate.

Neuroprotective: Ligustilide activates Nrf2/HO-1, reduces neuroinflammation, and protects against cerebral ischaemia-reperfusion injury in animal models. BDNF upregulation has been noted. Relevant for cognitive support and neuroprotective formulations. Claim strength: Moderate.

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Dosage & Formulator Specification

TCM Dong Quai dose: 3–9 g/day dried root as decoction. For Herbuno’s Ligustilide 1% Dong Quai extract: 500–2000 mg/day extract (delivering 5–20 mg ligustilide/day). Note that ligustilide is volatile — it evaporates during heating/extraction unless carefully managed. Preparations using whole dried root or alcohol extraction preserve ligustilide better than water decoctions at high temperatures.

Ligustilide content is highly variable in commercial Dong Quai preparations due to its volatile nature. Request HPLC quantification of ligustilide (not just total phthalides) in CoA. Herbuno’s 1% standardised extract is specifically validated for ligustilide content. Store in sealed, cool conditions to minimise evaporative loss.

Pregnancy contraindication: Dong Quai preparations including ligustilide are contraindicated in pregnancy due to uterine stimulant activity. This is an established contraindication and must be clearly stated on product labels containing Dong Quai or ligustilide. Not to be used during the first and second trimesters under any formulation scenario.

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Frequently Asked Questions — Ligustilide

Is ligustilide estrogenic like some other Dong Quai constituents?
Ligustilide itself is not considered directly estrogenic — its primary activity is as a smooth muscle relaxant and vasodilator via calcium channel antagonism. Dong Quai contains other constituents including ferulic acid that may have weak phytoestrogenic activity, but ligustilide is not the estrogenic component. This is relevant to the ongoing debate about whether Dong Quai is genuinely phytoestrogenic; the current evidence suggests its gynaecological effects are primarily mediated by smooth muscle and vasodilatory mechanisms rather than ER activity.

Why is ligustilide volatility a quality control concern?
Ligustilide is a low-boiling phthalide that evaporates readily at processing temperatures above 40–50°C. Traditional Dong Quai decoctions boiled for extended periods significantly reduce ligustilide content. Extraction methods and post-extraction processing must be carefully controlled to preserve ligustilide. Spray-dried extracts are particularly at risk; encapsulation immediately after extraction and cool storage are required to maintain declared ligustilide content through shelf life.

Is Dong Quai appropriate for men’s health formulations?
Despite its “female ginseng” designation, ligustilide’s vasodilatory, neuroprotective, and anti-inflammatory properties are pharmacologically non-sex-specific. Dong Quai is used in some TCM prescriptions for men (particularly for cardiovascular and haematological indications). For mainstream Western supplement positioning, the gynaecological heritage means Dong Quai is commercially positioned primarily for women’s health; using Chuan Xiong (Ligusticum chuanxiong) as the botanical source provides equivalent ligustilide without the female-specific positioning.

Can ligustilide be combined with other menstrual health ingredients?
Yes. Dong Quai (ligustilide) is classically combined in TCM with peony root (Bai Shao, containing paeoniflorin for uterine relaxation), Chuan Xiong (ligustilide + tetramethylpyrazine for circulation), and rehmannia (for tonification). Western supplement formulations for menstrual cramp relief rationally combine Dong Quai extract with cramp bark, ginger, and magnesium for complementary smooth muscle and anti-inflammatory coverage.

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Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.

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