California Poppy

California Poppy is a North American plant traditionally used as a sedative and anxiolytic tea. It contains unique isoquinoline alkaloids (californidine, escholtzine, protopine) that interact with GABA, opioid, and serotonin receptors. Animal studies confirm sedative and anxiolytic effects. Limited human evidence exists - one trial used a combination product (Sympathyl) containing California poppy with hawthorn and magnesium for anxiety. The alkaloids show interesting receptor interactions but human efficacy data as a standalone supplement is lacking.

Quick Answer

What it is

Key findings

Grade C: Anxiety
Grade D: Sleep Quality
Grade D: Pain

Safety

No specific caution or interaction language was detected in the current summary/outcome notes.

ℹ️ Quick Facts: California Poppy

Quick Facts: California Poppy

Best Evidence:Grade C
Conditions Studied:1
Research Outcomes:4
Key Effect:Anxiety Disorders (Other)

Outcomes by grade:

1 conditions · 4 outcomes

Detailed Outcomes

Anxiety

In rodent models, California poppy extracts showed anxiolytic effects in elevated plus-maze and behavioral tests, attributed to GABA-A receptor and 5-HT1A receptor modulation by isoquinoline alkaloids. One double-blind, placebo-controlled RCT (n=264) found a combination product (Sympathyl) containing California poppy, hawthorn, and magnesium significantly reduced mild-to-moderate anxiety scores, though the individual contribution of California poppy cannot be isolated from the other ingredients.

264 participants

moderate↓Improves

Sleep Quality

In rodent studies, California poppy extracts prolonged barbiturate-induced sleeping time and reduced locomotor activity, consistent with sedative properties mediated through GABA-A receptor and benzodiazepine binding site modulation. No human clinical trials have evaluated California poppy as a standalone sleep aid.

moderate↑Improves

Pain

California poppy alkaloids (protopine, escholtzine) demonstrate weak binding affinity for opioid receptors in vitro, and the plant has longstanding traditional use for pain relief among Native American populations. Limited animal data suggest mild analgesic effects, but no human clinical trials have evaluated standalone analgesic efficacy.

small↓Improves

Drug Metabolism Interactions

In vitro studies demonstrate that California poppy alkaloids modulate cytochrome P450 enzymes (CYPs), P-glycoprotein (P-gp), and pregnane X receptor (PXR), suggesting potential for herb-drug interactions. A 2023 study confirmed alkaloid intestinal permeability and microbiota interactions, but clinical significance in humans remains uncharacterized.

small↑Improves

Evidence by Condition

Best grade per condition (each condition may have multiple outcomes)

CAnxiety Disorders (Other)

1 outcome · 5 studies

↓AnxietyImproves

Research Citations (12)

Comprehensive Metabolomic Profiling and Biological Activity Analysis of Eschscholzia californica Extracts Using LC-ESI-QTOF-MS.

Food Science & Nutrition (2025)

PMID: 40909255

Alkaloids in commercial preparations of California poppy - Quantification, intestinal permeability and microbiota interactions.

Biomedicine & Pharmacotherapy (2023)

PMID: 37673017

Modulation of CYPs, P-gp, and PXR by Eschscholzia californica (California Poppy) and Its Alkaloids.

Planta Medica (2016)

PMID: 27054913

Modulatory Effects of Eschscholzia californica Alkaloids on Recombinant GABAA Receptors.

Biochemistry Research International (2015)

PMID: 26509084

Plant-based medicines for anxiety disorders, Part 1: a review of preclinical studies.

CNS Drugs (2013)

PMID: 23436255

Alkaloids from Eschscholzia californica and their capacity to inhibit binding of [3H]8-Hydroxy-2-(di-N-propylamino)tetralin to 5-HT1A receptors in Vitro.

Journal of Natural Products (2006)

PMID: 16562853

A double-blind, placebo-controlled study of an herbal combination product for the treatment of mild to moderate anxiety

Curr Med Res Opin (2004)

PMID: 14696882

Double-blind, randomised, placebo-controlled study to evaluate the efficacy and safety of a fixed combination containing two plant extracts (Crataegus oxyacantha and Eschscholtzia californica) and magnesium in mild-to-moderate anxiety disorders.

Current Medical Research and Opinion (2004)

PMID: 14741074

Neurotropic action of the hydroethanolic extract of Eschscholzia californica

Planta Med (2001)

PMID: 15070161

Neurophysiological effects of an extract of Eschscholzia californica Cham. (Papaveraceae).

Phytotherapy Research (2001)

PMID: 11507727

Related Supplements

Spikenard

1 shared condition · 8 outcomes

Spikenard (Jatamansi) is an Ayurvedic herb traditionally used for calming, cognitive enhancement, and neuroprotection. Similar traditional uses to Bacopa but with less research. Contains sesquiterpenes and volatile oils. NO GRADED OUTCOMES - human research is very limited. Preclinical studies show neuroprotective potential. Traditionally used for epilepsy, anxiety, and memory. The plant is endangered due to overharvesting; sustainable sourcing is a concern.

Saffron

1 shared condition · 390 outcomes

Saffron is a spice with antioxidant properties derived from the flowering plant Crocus sativus. When used as a supplement, saffron seems to be effective at reducing symptoms of depression and possibly anxiety.

Pinitol

1 shared condition · 5 outcomes

Pinitol (D-pinitol) is a methylated inositol found in legumes, carob, and pine trees. Converts to D-chiro-inositol in the body. Both are insulin sensitizers studied for diabetes and PCOS. Mechanism involves insulin signaling enhancement and GLUT4 translocation. Some human studies show blood glucose benefits. Also studied for creatine-like effects in muscle (may enhance creatine uptake). Related to myo-inositol but different effects. Marketed in some sports supplements as insulin mimetic.

Phellodendron amurense

1 shared condition · 6 outcomes

Phellodendron amurense is a Traditional Chinese Medicine (TCM) herb used for inflammation, infection, and bone conditions. Contains berberine (same alkaloid as in berberine supplements) and other alkaloids. Often combined with Magnolia officinalis in 'Relora' for stress/cortisol. NO GRADED OUTCOMES for the herb itself. Anti-inflammatory and antimicrobial effects in preclinical research. Limited Western clinical evidence. The berberine content may provide some of the effects attributed to berberine supplements.

Palmatine

1 shared condition · 9 outcomes

Palmatine is a protoberberine alkaloid found alongside berberine in plants like Coptis, Phellodendron, and Berberis. Shares many mechanisms with berberine (AMPK, metabolic effects) but less potent. Some unique sedative/anxiolytic properties via GABA-A and D2 receptor modulation. Used in Traditional Chinese Medicine. Limited human studies compared to berberine. May contribute to effects of berberine-containing extracts but rarely supplemented alone.

Oleamide

1 shared condition · 9 outcomes

Oleamide is an endogenous fatty acid amide produced naturally in the brain, accumulating during sleep deprivation. It induces sleep and modulates cannabinoid receptors (CB1). Structurally derived from oleic acid with nitrogen group. Animal studies show potent sleep-inducing effects via GABAergic potentiation and endocannabinoid system modulation. NO human clinical trials. Found in dark chocolate. May interact with anandamide degradation. Research limited to preclinical - cannot recommend for supplementation.

Muira puama

1 shared condition · 6 outcomes

Muira puama is a Brazilian herb traditionally used as an aphrodisiac and nerve tonic. The nickname 'Potency Wood' reflects its traditional sexual health use, but human evidence for sexual benefits is weak. Interestingly, preliminary research suggests it may be effective as a COGNITIVE ENHANCER rather than an aphrodisiac. Contains lupeol and other triterpenoids. NO GRADED OUTCOMES - lacks quality human trials for either sexual or cognitive claims. The cognitive enhancement angle warrants more research.

Matured Hop Extract

1 shared condition · 5 outcomes

Matured hop extract (MHBA) consists of iso-α-acids from hops (Humulus lupulus) that have undergone oxidation during storage, converting to more complex bitter compounds. Found in aged beer and marketed as a supplement. NO GRADED OUTCOMES - limited research. Proposed benefits include cognitive function, anti-inflammatory effects, and metabolic health. Different from fresh hop extracts used for sleep/relaxation. Research is emerging but insufficient for recommendations.