Goji

botanical

What is it

Goji berry, also called wolfberry (Lycium barbarum or Lycium chinense), is a small red-orange fruit native to China. It has been used in traditional Chinese medicine for centuries and is consumed dried, as juice, or as powder. The berries contain a distinctive class of polysaccharides studied for immune and antioxidant effects.

How it works

Goji berries contain Lycium barbarum polysaccharides (LBP), a class of glycoconjugates that account for much of the berry's pharmacological activity in research. LBPs have been studied for immunomodulatory, antioxidant, and anti-inflammatory effects in cell and animal models, though human evidence is more limited. The berries are also rich in zeaxanthin, a carotenoid that accumulates in the retina and helps protect against light damage. Goji is one of the most concentrated dietary sources of zeaxanthin. Additional bioactives include carotenoids (beta-carotene, lutein), flavonoids, and modest vitamin C content. Goji berries also contain betaine, several amino acids, and trace minerals. In traditional Chinese medicine, goji is considered nourishing for the liver, kidneys, and eyes. Modern research has focused mainly on the polysaccharide fraction and the carotenoid content.

Evidence for 5 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Eye health (macular pigment)

Grade B

Good evidence

Several randomized trials show goji berry consumption increases macular pigment optical density (MPOD), a measure of zeaxanthin in the retina. MPOD increases are associated with reduced risk of age-related macular degeneration progression.

Antioxidant status

Grade C

Moderate evidence

Trials of goji juice or extract show increased blood antioxidant capacity and reduced markers of oxidative stress over weeks of consumption. Whether this translates to long-term clinical benefits is unclear.

Immune function

Grade C

Moderate evidence

Small trials suggest goji polysaccharide-rich extracts may modestly increase certain immune markers, though clinical outcomes such as infection rates have not been well demonstrated in humans.

Subjective well-being

Grade C

Moderate evidence

Some trials of standardized goji juice report improvements in subjective measures of energy, sleep quality, and well-being. Methodological limitations (open-label or quasi-blinded) limit conclusions.

Metabolic markers

Grade D

Mixed evidence

Limited evidence suggests possible modest improvements in glucose and lipid markers; trials are small and inconsistent.

4 commercial forms

Dried goji berries

Whole-fruit form; retains carotenoids and polysaccharides.

Sun-dried berries with a chewy texture and mild sweet-tart flavor. Often added to oatmeal, salads, or tea.

Goji juice

Liquid form; check for standardization and added sugars.

Bottled juice, often standardized to polysaccharide content. Quality varies between brands.

Goji powder

Concentrated; convenient mixing into smoothies.

Dried, ground berries. Useful for smoothies and recipes. Color and potency vary by processing.

Standardized polysaccharide extract

Concentrated LBP for research-style dosing.

Capsules with extract standardized to specific LBP percentages. Used in some clinical research.

Dosage

There is no RDA. Studies have used 15 to 30 g of dried berries daily, or 120 to 150 mL of standardized goji juice. Polysaccharide-standardized extracts have been used at lower doses. No formal Upper Limit.

When and how to take it

Goji can be eaten at any time of day. The carotenoids (zeaxanthin, beta-carotene) are fat-soluble and are absorbed better when consumed with a meal containing fat. Polysaccharides and other water-soluble nutrients do not require fat. Dried berries are commonly added to tea, oatmeal, or trail mixes.

Safety

Goji berries are generally well tolerated as a food. Reported side effects are uncommon and include mild gastrointestinal upset and rare allergic reactions. Some people experience photosensitivity or skin reactions. Quality and contamination vary widely by source; some goji products have been found to contain pesticide residues or contaminants.

Who should be cautious

People taking warfarin should avoid goji or consult their clinician carefully, with frequent INR monitoring. Those on antidiabetic or antihypertensive medications should monitor for additive effects. Pregnant women should avoid concentrated extracts; dried berries in small amounts are generally considered acceptable but research is limited. People with nightshade sensitivities should know goji is in the nightshade family.

Interactions

Goji has been reported to interact with warfarin, with several case reports of increased INR and bleeding. The mechanism may involve inhibition of warfarin metabolism by CYP2C9. Goji may also have additive effects with antidiabetic and antihypertensive medications. Caution is advised with concurrent medication use.

Frequently asked questions

Is goji safe with warfarin?⌄

There are case reports of goji increasing the effects of warfarin, leading to elevated INR and bleeding. People on warfarin should avoid goji or consult their clinician with frequent INR monitoring.

How much zeaxanthin do goji berries contain?⌄

Goji berries are one of the most concentrated dietary sources of zeaxanthin. A typical 30 g serving of dried berries may provide several milligrams of zeaxanthin, a substantial portion of daily intake associated with eye health benefits.

What is the difference between goji and wolfberry?⌄

They are the same fruit. 'Goji' is the marketing name popularized in Western markets; 'wolfberry' is the traditional English name. Both refer to Lycium barbarum or related Lycium species.

How many goji berries should I eat per day?⌄

Most clinical studies use 15 to 30 g of dried berries daily (about a small handful). Higher doses have not shown additional benefit and may increase the risk of side effects.

Are all goji products the same quality?⌄

No. Goji berries are sometimes contaminated with pesticides or heavy metals, particularly from low-quality suppliers. Look for organic certification and third-party testing where possible.

References

  • Goji (Wikidata) — Wikidata link

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Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you're pregnant, breastfeeding, on medications, or managing a chronic condition.