🌾Vietnamese Traditional Medicine

Grewia Fruit (Cò Ke)

Grewia nervosa

About Grewia Fruit (Cò Ke)

Grewia Fruit (Cò Ke) (Grewia nervosa) is a herb used in the Vietnamese Traditional Medicine tradition to help with Digestive Issues, Constipation, Liver Support, and Kidney Support. The fruit / berries are the part traditionally used, taken internally.

Botanical background

Microcos paniculata (simplified Chinese: 布渣叶; traditional Chinese: 布渣葉) is a flowering shrub native to China and south-east Asia. It is sometimes added to Chinese herbal tea, having a mildly sour taste. In traditional Chinese medicine the plant is believed to help the digestive system, and it is also used for other health problems including colds, hepatitis, diarrhea, heat stroke, and dyspepsia. None of these alleged claims have shown to be effective in clinical trials. The herb...

Source: Wikipedia, via iNaturalist

Parts used

Fruit / Berries · internal
🍵

Tea / Infusion

1–3 cups daily
  • Steep 1–2 tsp of dried Grewia Fruit (Cò Ke) in freshly boiled water for 5–10 minutes.
  • Cover while steeping.
  • Strain and drink.
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Tincture

20–40 drops in water, 2–3× daily
  • Pack dried Grewia Fruit (Cò Ke) into a jar and cover with 40–60% alcohol.
  • Seal and steep for 4–6 weeks, shaking daily.
  • Strain and store in a dark dropper bottle.
💊

Powder / Capsule

500 mg – 1 g, 1–3× daily
  • Grind dried Grewia Fruit (Cò Ke) into a fine powder.
  • Fill size 00 capsules or stir into smoothies or honey.

Pregnancy, Breastfeeding & Children

No herb-specific pregnancy/child safety research is documented for Grewia Fruit (Cò Ke) in our references — the guidance below is based on its general effect category, not research on Grewia Fruit (Cò Ke) itself. Always confirm with a midwife, doctor, or pediatrician.

Pregnancy

Use Caution

This herb is processed through the liver, which is already working harder during pregnancy — generally used cautiously and not at high/concentrated doses without guidance. This is a general, mechanism-based caution, not herb-specific research.

Breastfeeding

Use Caution

Liver-processed compounds can appear in breast milk — generally used cautiously and in moderation.

Children

Use Caution

A child's liver is still developing its full drug/herb-processing capacity — these herbs are generally used cautiously and at reduced, age-appropriate doses.

Contraindications

  • Active liver disease — monitor liver enzymes with long-term use
  • Significant kidney impairment — diuretic herbs may worsen renal function

Warnings

⚠️ Liver Health

Some herbs used for liver conditions can be hepatotoxic at high doses. Have liver function monitored if using long-term.

⚠️ Kidney Disease

Some diuretic herbs are contraindicated in those with kidney disease. Consult your doctor if you have impaired kidney function.

⚠️ Allergic Reactions

Discontinue immediately if you experience rash, itching, swelling, or difficulty breathing.

⚠️ Not Medical Advice

This information is for educational purposes only. Always consult a qualified healthcare provider before using herbal remedies.

Drug & herb interactions

May affect drug absorption

Watch for: Any oral medication taken around the same time

High-fiber or mucilage-rich herbs can slow or reduce how much of another oral drug is absorbed — space doses a couple of hours apart.

Processed by the liver

Watch for: Any medication that is also processed by liver enzymes (ask your pharmacist — this includes many common prescriptions)

Can alter how quickly the body clears certain medications, raising or lowering their effective dose.

May have a diuretic effect

Watch for: Diuretic medications and lithium

Additive fluid loss can affect electrolyte balance and change how the body clears lithium.

Where to find in nature

Native region

Vietnam, southern China

Climate

Tropical to subtropical

Habitat

Tropical forests, rice paddy borders, and village herb gardens of Vietnam

🌿 To see Grewia Fruit (Cò Ke) growing, visit botanical gardens, university plant collections, or specialist herb nurseries near you. If foraging in the wild, always work with an expert identifier — never consume a plant you are not 100% certain of.

Where to buy

In store

  • Health food stores (Whole Foods, Natural Grocers, Holland & Barrett, GNC)
  • Naturopathic clinics and integrative medicine practices
  • Specialist herbal apothecaries and herbalist practices
  • Farmers markets with herb vendors

Online

iHerb

Wide selection of standardised extracts, capsules, and powders with lab testing

Mountain Rose Herbs

Premium bulk dried herbs — certified organic, ethically sourced

Starwest Botanicals

Large selection of certified organic bulk herbs and powders

Herb Pharm

High-quality liquid extracts and tinctures, rigorous quality standards

Amazon

Convenient — verify brand certifications and check third-party testing

Etsy

Small-batch artisan herbalists, hand-harvested and wildcrafted herbs

Quality tips

When buying Grewia Fruit (Cò Ke), look for: certified organic labelling, clearly stated country of origin, third-party lab testing for heavy metals and pesticides, and a batch expiry date. Standardised extracts offer consistent dosing; bulk dried herbs are more economical for regular use. Avoid very cheap, unlabelled products — quality varies enormously.