Zephyranthes grandiflora (Zephyranthes grandiflora): Benefits, Dosage, Safety & Evidence

Frequently asked questions

How does Zephyranthes grandiflora work for diabetes?

Zephyranthes grandiflora contains bioactive alkaloids, specifically lycorine and tazettine, along with flavonoids. These compounds are believed to influence glucose metabolism, though the exact mechanism remains under investigation. Research suggests these constituents may contribute to hypoglycemic activity, supporting its traditional use for blood sugar control (Evidence Level: C).

Can I take Zephyranthes grandiflora with metformin or other diabetes medications?

You should avoid taking Zephyranthes grandiflora alongside prescription diabetes medications like metformin without medical supervision. Because the herb possesses blood sugar-lowering properties, combining it with pharmaceutical drugs may cause hypoglycemia (dangerously low blood sugar). Consult a healthcare provider before adding this herb to any regimen involving antidiabetic drugs.

What is the recommended dosage for Zephyranthes grandiflora tea?

Traditional preparation involves steeping 3 to 5 grams of dried leaves in a cup of hot water. This tea is typically consumed twice daily. It is crucial to avoid ingesting the bulb, as it is toxic. Always adhere to recommended quantities to minimize the risk of adverse side effects like nausea.

Is Zephyranthes grandiflora safe during pregnancy?

No, Zephyranthes grandiflora is considered unsafe during pregnancy. The plant contains potent alkaloids, such as lycorine, which can stimulate uterine contractions and pose a risk of miscarriage. Additionally, the bulb is toxic and should never be ingested. Pregnant and breastfeeding women should strictly avoid this herb.

What are the side effects of Zephyranthes grandiflora?

Common side effects include nausea and gastrointestinal distress, particularly if the toxic bulb is accidentally ingested. The presence of alkaloids like lycorine can cause more severe reactions in sensitive individuals. Due to the potential for toxicity, proper identification and preparation using only the leaves are essential for safety.

PubMed-compiled information sheet

This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.

Compiled from 11 PubMed articles · model: gemma4:31b

Summary

Zephyranthes grandiflora is a plant species containing various Amaryllidaceae alkaloids and lectins that demonstrate in vitro cytotoxic and anti-inflammatory properties [PMID:30179638, PMID:33502261, PMID:23513717].

Background

Zephyranthes grandiflora is a member of the Amaryllidaceae family with high ornamental value and contains bioactive compounds [PMID:33442831].

Active compounds

The plant contains Amaryllidaceae alkaloids including galanthamine [PMID:39065458], lycoramine, hamayne, haemanthamine, tortuosine [PMID:22939505], lycorine, galanthine, and ungeremine [PMID:23513717], as well as a new betaine-type alkaloid called zephgrabetaine [PMID:23513717]. It also contains 4a-epi-plicamine-type alkaloids (zephygranditines A-F and zephyranthines A-C) [PMID:30179638, PMID:33502261] and a mannose-binding agglutinin (ZGA) [PMID:19067248, PMID:15553865].

Mechanism of action

Certain alkaloids from the plant inhibit the production of nitric oxide (NO) and inhibit Cox-1/Cox-2 [PMID:30179638].

Clinical evidence

Evidence DMalignant melanoma

Zephygranditines 1-3 exhibited cytotoxic activity in vitro with IC50 values <20 μM [PMID:30179638]

Evidence DGlioma

Zephyranthines 2 and 3 exhibited significant in vitro cytotoxic activities against six glioma cell lines with IC50 values <20 μM [PMID:33502261]; additionally, lycorine and haemanthamine showed prominent cytotoxic activity against rat glioma cells (C-6) [PMID:23513717]

Evidence DInflammation

Zephygranditines 1 and 2 displayed anti-inflammatory activity by inhibiting nitric oxide production and Cox-1/Cox-2 in vitro [PMID:30179638]

Evidence summary

The current evidence is limited to in vitro phytochemical studies and laboratory-based cytotoxic assays; there are no human clinical trials available.

PubMed sources

1.PMID: 30179638 (2018) — Cytotoxic and anti-inflammatory active plicamine alkaloids from Zephyranthes grandiflora. · Fitoterapia
2.PMID: 39065458 (2024) — Tissue-Specific Natural Synthesis of Galanthaminein Zephyranthes Species and Its Accumulation in Different In Vitro-Grown Organs Following Methyl Jasmonate Treatment. · Plants (Basel, Switzerland)
3.PMID: 33502261 (2022) — Cytotoxic plicamine alkaloids from the whole plants of Zephyranthes grandiflora. · Journal of Asian natural products research
4.PMID: 33442831 (2021) — Mass propagation through direct and indirect organogenesis in three species of genus Zephyranthes and ploidy assessment of regenerants through flow cytometry. · Molecular biology reports
5.PMID: 22939505 (2012) — Simultaneous quantification of Amaryllidaceae alkaloids from Zephyranthes grandiflora by UPLC-DAD/ESI-MS/MS.

Zephyranthes grandiflora

Sources & Citations

Calculate a safe dose of Zephyranthes grandiflora