Protopine (Isoquinoline Alkaloid · Antispasmodic · Biliary · Anxiolytic)

Compound	Protopine
Chemical class	Alkaloid — Isoquinoline (Protopine-type, Benzylisoquinoline)
CAS	130-86-9
Primary source	Fumaria officinalis (fumitory), Chelidonium majus, Corydalis spp., Eschscholzia californica (California poppy)
Key applications	Antispasmodic, biliary, anxiolytic, anti-arrhythmic
Claim strength	Moderate
Typical form	Fumitory extract; California poppy extract; Corydalis co-constituent
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Commercial source: Protopine is commercially available as a primary constituent of Fumaria officinalis (fumitory) extract and as a co-constituent of Eschscholzia californica (California poppy) and Corydalis species extracts. See sourcing options below. Traditional use: Fumitory (Fumaria officinalis) has traditional use in European, Arabic, and Ayurvedic medicine for digestive and hepatobiliary complaints, skin conditions, and as a cardiotonic herb. California poppy has Native American and European phytomedicine use as a mild sedative and analgesic — distinct from the opium poppy and non-narcotic. Corydalis species containing protopine have TCM use for pain and cardiovascular complaints. Research trajectory: Protopine has documented antispasmodic, anti-arrhythmic (calcium channel antagonism), antimicrobial, and antiplatelet activities. It is also one of the primary anxiolytic/sedative alkaloids in California poppy extract, though without direct benzodiazepine or opioid receptor activity. See sourcing options below.

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Evidence for Protopine Applications

Antispasmodic and biliary: Protopine relaxes smooth muscle via calcium channel antagonism (shared mechanism with ligustilide), producing antispasmodic effects in biliary and intestinal smooth muscle. This supports fumitory’s traditional use for biliary spasm, dyspepsia, and functional digestive complaints. Claim strength: Moderate.

Anti-arrhythmic: Protopine blocks sodium and calcium channels in cardiac muscle, reducing automaticity and prolonging refractory period. In animal electrophysiology studies, it demonstrates antiarrhythmic activity. This is a mechanistically differentiated cardiovascular application. Claim strength: Moderate (preclinical; no human antiarrhythmic trials).

Anxiolytic/sedative (California poppy context): In California poppy extract, protopine is considered a key contributor alongside eschscholzine and californidine to the mild sedative and anxiolytic activity documented in small human studies. The mechanism does not involve direct GABA-A or opioid receptor binding at typical supplement doses; monoamine reuptake inhibition has been proposed. Claim strength: Moderate (California poppy extract human evidence; protopine-specific attribution limited).

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Dosage & Formulator Specification

Fumitory extract traditional European dose: 6–10 g dried herb/day as infusion. For standardised fumitory extract: 150–300 mg/day. California poppy extract for sedative/anxiolytic applications: 200–400 mg/day standardised extract, with protopine as one of several co-active alkaloids. No isolated protopine clinical dose has been established.

Protopine is present at 0.1–0.5% in fumitory and California poppy extracts. Isolated protopine is available as a research-grade material. Stability in extract formats is good. Standard supplement manufacturing conditions are appropriate. No major safety concerns are documented for protopine at supplement concentrations from standardised botanical extracts.

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Frequently Asked Questions — Protopine

Is California poppy an opioid-containing plant?
No — California poppy (Eschscholzia californica) is completely unrelated to the opium poppy (Papaver somniferum) and contains no opioid alkaloids (morphine, codeine). Its sedative alkaloids (protopine, eschscholzine, californidine) have mild serotonergic and dopaminergic activity without direct opioid receptor agonism. California poppy is a legal and non-controlled botanical in the US and EU used in sleep and anxiety support supplements.

Is fumitory extract appropriate for SIBO or gut dysbiosis formulations?
Fumitory’s antispasmodic, mildly antimicrobial, and choleretic (bile-stimulating) properties make it rationally applicable to functional digestive support formulations. Traditional European phytomedicine has used fumitory for dyspepsia, IBS-related spasm, and biliary insufficiency. It is a sensible inclusion in herbal digestive formulas alongside artichoke, ginger, and gentian for comprehensive functional dyspepsia support.

What is protopine’s anti-arrhythmic mechanism and is it significant at supplement doses?
Protopine blocks sodium and calcium channels at micromolar concentrations in ex vivo cardiac preparation studies. At typical supplement exposure levels from fumitory or California poppy extract, plasma protopine concentrations are likely sub-therapeutic for clinically significant antiarrhythmic activity. The mechanism is pharmacologically interesting and consistent with traditional cardiovascular use, but should not be claimed as cardiac antiarrhythmic activity at supplement doses.

Can protopine-containing California poppy extract be used in children’s sleep formulations?
California poppy extract is included in some European phytomedicine pediatric sleep and anxiety products. The established safety record from traditional pediatric use suggests reasonable tolerability at low doses. However, regulatory status for pediatric use varies by market, and the lack of modern clinical trial data in children warrants consultation with a regulatory specialist before including protopine-containing botanicals in paediatric formulations.

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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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