Coreopsis tinctoria (Coreopsis tinctoria): Benefits, Dosage, Safety & Evidence

Frequently asked questions

How does Coreopsis tinctoria work to lower blood sugar?

Coreopsis tinctoria contains bioactive flavonoids, particularly marein and okanin, which may support blood sugar regulation through multiple pathways. These compounds appear to enhance glucose uptake in cells and support pancreatic beta-cell function. The chalcones present in the plant demonstrate antioxidant activity that may protect against oxidative stress associated with diabetes. However, human clinical trials are limited, and the precise mechanisms require further research. Evidence level: C (preliminary evidence from in vitro and animal studies).

Does Coreopsis tinctoria interact with diabetes medications?

Coreopsis tinctoria may potentially interact with antidiabetic medications due to its blood sugar-lowering effects. Combining this herb with insulin or oral hypoglycemic agents could theoretically cause additive effects, leading to hypoglycemia. Limited clinical data exists on specific interactions. Patients taking metformin, sulfonylureas, or other diabetes medications should consult a healthcare provider before using Coreopsis tinctoria and monitor blood glucose levels closely. Evidence level: C (theoretical risk based on mechanism of action).

What is the recommended dosage for Coreopsis tinctoria tea?

The traditional adult dosage for Coreopsis tinctoria is 3-5 grams of dried flowers prepared as a tea, taken twice daily. To prepare, steep the dried flowers in hot water for 10-15 minutes before straining. Standardized extracts are not widely available, and optimal therapeutic dosing has not been established through clinical trials. Start with lower doses to assess tolerance and increase gradually if needed. Evidence level: C/Traditional (based on ethnobotanical use rather than clinical studies).

Is Coreopsis tinctoria safe during pregnancy and breastfeeding?

Coreopsis tinctoria is considered unsafe during pregnancy and should be avoided. The plant contains compounds that may stimulate uterine contractions or affect fetal development, though specific teratogenic studies are lacking. There is insufficient safety data for breastfeeding women, so use is not recommended during lactation either. Women who are pregnant, planning pregnancy, or nursing should consult a qualified healthcare provider for alternative remedies. Evidence level: D (insufficient human safety data; precautionary avoidance recommended).

What are the side effects of Coreopsis tinctoria?

Coreopsis tinctoria is generally well-tolerated at recommended doses. Reported side effects are primarily mild gastrointestinal upset, including nausea or stomach discomfort in some individuals. People with known allergies to plants in the Asteraceae family, such as ragweed, marigolds, chamomile, or daisies, should avoid Coreopsis tinctoria due to potential allergic reactions. No serious adverse events have been documented in available literature, though comprehensive safety studies remain limited. Evidence level: C.

What is Coreopsis tinctoria used for in traditional medicine?

Coreopsis tinctoria has been used traditionally by Navajo and other North American indigenous peoples primarily for digestive complaints and respiratory conditions. The dried flowers were prepared as tea to address stomach discomfort, coughs, and breathing difficulties. The plant has also gained research attention for potential blood sugar regulation properties. Additionally, Coreopsis tinctoria has a long history as a natural dye plant, producing yellow to reddish-brown colors for textiles. Evidence level: C/Traditional (historical use with limited clinical validation).

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 30 PubMed articles · model: gemma4:31b

Summary

Coreopsis tinctoria is a traditional medicinal plant used in North America, Europe, and Asia, recognized for its antioxidant, antihyperglycemic, and anti-inflammatory properties [PMID:33309917, PMID:38919005].

Background

Coreopsis tinctoria Nutt. (family Asteraceae), also known as 'Snow Chrysanthemum' or 'Shemuju', is a medicinal plant found in plateau areas exceeding 3000m, particularly in regions like Xinjiang, China [PMID:33309917, PMID:38084786, PMID:24228578].

Traditional uses

It has been used traditionally for disinfection, treatment of sexual infections, diarrhea, acute and chronic dysentery, red-eye swelling, pain, heat, thirst, hypertension, palpitation, gastrointestinal discomfort, and loss of appetite [PMID:33309917]. In Portugal, flowering tops infusion is used for diabetes symptoms [PMID:22143153], and in Xinjiang, it is consumed as a herbal tea for high blood pressure and diarrhea [PMID:30630477].

Active compounds

The plant is rich in flavonoids, including marein, flavanomarein, okanin, kaempferol, quercetin, and isorhamnetin [PMID:35334817, PMID:36570002, PMID:35962784, PMID:40437103]. Other identified compounds include polyacetylenes [PMID:25563069], biflavonones (sikokianin D and E) [PMID:28374625], and various chalcones and flavanones [PMID:30499349, PMID:36630026].

Mechanism of action

Mechanisms include the modulation of SIRT1/Nrf2 signaling to alleviate oxidative stress and lipid accumulation [PMID:40437103], inhibition of IKKβ-mediated NF-κB p65 phosphorylation to protect against bone loss [PMID:41109043], and regulation of TGF-β1/SMADS/AMPK/NF-κB pathways to reduce renal fibrosis [PMID:30630477]. It also acts via SIRT3 pathways to protect against UVA-induced mitochondrial dysfunction [PMID:41008947] and modulates Nrf2/HO-1 and MAPK pathways for neuroprotection [PMID:41906277].

Clinical evidence

Evidence DHyperglycemia/Diabetes

C. tinctoria and its flavonoids lowered body weight, reduced fasting blood glucose, and improved glucose tolerance and insulin resistance in obese mice [PMID:35334817]; reversed levels of glucose, insulin, and HbA1c in db/db mice [PMID:36736673].

Evidence DHyperlipidemia

Flavonoids from C. tinctoria adjusted lipid metabolism by down-regulating adipose differentiation-related protein (ADRP) in hyperlipemia mice [PMID:25512113].

Evidence DSkin Photoaging

Okanin reduced malondialdehyde content and relieved epidermal hyperplasia and dermal damage caused by UVB irradiation in mice [PMID:39024749].

Evidence DOsteoporosis

Okanin attenuated ovariectomy-induced bone loss in a murine model [PMID:41109043].

Evidence DChronic Myelogenous Leukemia (CML)

Flower extracts were investigated for their ability to impair CML cell survival (K562 cells) [PMID:38919005].

Evidence D

Evidence summary

The evidence consists primarily of in vitro cell studies and in vivo animal models (mice/rats), indicating strong potential for metabolic and antioxidant activity, but lacks human clinical trials.

PubMed sources

1.PMID: 33309917 (2021) — Traditional uses, phytochemistry, pharmacology, and toxicology of Coreopsis tinctoria Nutt.: A review. · Journal of ethnopharmacology
2.PMID: 28374625 (2017) — Two new biflavonones from Coreopsis tinctoria. · Journal of Asian natural products research
3.PMID: 38919005 (2024) — Optimizing Coreopsis tinctoria Flower Extraction and Inhibiting CML Activity: Box-Behnken Design. · Anti-cancer agents in medicinal chemistry
4.PMID: 25563069 (2015) — Novel polyacetylenes from Coreopsis tinctoria Nutt. · Journal of Asian natural products research
5.PMID: 35334817 (2022) — Coreopsis tinctoria and Its Flavonoids Ameliorate Hyperglycemia in Obese Mice Induced by High-Fat Diet. · Nutrients

Coreopsis tinctoria

Sources & Citations

Calculate a safe dose of Coreopsis tinctoria