Quick summary

Anthocyanins are antioxidant polyphenolic compounds found naturally in many colorful fruits and vegetables. They are studied for their potential antioxidant and anti-inflammatory properties. While early research is promising, conclusive and strong clinical evidence of definitive health benefits in humans remains limited at this time.

What is it?

Anthocyanins are a group of water-soluble pigments classified as flavonoids, a type of polyphenol. They give many fruits and vegetables their characteristic red, purple, and blue hues. These compounds are considered antioxidants because of their capacity to neutralize free radicals, molecules that can damage cells through oxidative stress.

How it may work in the body

Anthocyanins may influence health through several proposed mechanisms, including:

  • Scavenging free radicals and reactive oxygen species to reduce oxidative stress
  • Modulating inflammatory pathways
  • Influencing cellular signaling involved in redox homeostasis

These mechanisms are primarily supported by in vitro (test tube) and animal studies. Human clinical evidence confirming these effects and translating them into consistent health benefits is currently insufficient.

Common supplement forms

  • Anthocyanin-rich fruit extracts
  • Powdered berry concentrates
  • Capsules or tablets containing anthocyanin extracts

Typical dosage and how it is used

There is currently no official recommended daily intake (RDA) or adequate intake (AI) established for anthocyanins by health authorities. Dosages used in human clinical trials vary widely and lack standardization.

People considering anthocyanin supplements should consult healthcare providers, especially before taking higher doses or if they have underlying health conditions.

Natural sources

Anthocyanins are naturally present in a variety of colorful fruits and vegetables, including:

  • Blueberries
  • Blackberries
  • Raspberries
  • Cherries
  • Red cabbage
  • Purple grapes

Absorption and bioavailability

Anthocyanins generally have relatively low bioavailability due to limited absorption in the gastrointestinal tract and rapid metabolism and elimination. This means that only a small proportion of the ingested anthocyanins may reach systemic circulation in an active form.

Differences in supplement forms and factors affecting absorption, such as food matrix and metabolism, remain areas where further research is needed.

Potential benefits: what does the evidence say?

Antioxidant and anti-inflammatory support

Initial human studies suggest anthocyanins may help reduce markers of oxidative stress and inflammation. However, findings are inconsistent and limited by small sample sizes, short study durations, and study design variability.

Overall, the evidence supporting clinically meaningful benefits for antioxidant or anti-inflammatory outcomes in humans is considered limited at present.

Side effects and safety

Available data do not indicate common adverse side effects associated with anthocyanin consumption from foods or supplements. However, safety information remains incomplete.

No specific contraindications or toxicity from typical doses are reported in the current literature, but comprehensive data on long-term safety and high-dose use are lacking.

Drug and supplement interactions

No clear evidence exists regarding interactions between anthocyanins and medications or other supplements. Given incomplete interaction data, caution is advised for users taking prescription drugs or multiple supplements.

Who should be careful?

Individuals who are pregnant, breastfeeding, have medical conditions, are taking medications, or are planning surgery should consult healthcare professionals before using anthocyanin supplements.

Pregnancy, breastfeeding and special populations

Specific safety data for anthocyanin supplements during pregnancy and breastfeeding are not available. Because of this lack of evidence, pregnant or nursing individuals are generally advised to avoid supplementation beyond normal dietary intake unless recommended by a healthcare provider.

Quality, standardization and what to look for

Because anthocyanin supplements are derived from various fruits and plants, their anthocyanin content and composition can vary significantly. Quality control, standardization of active components, purity, and absence of contaminants are important considerations when choosing a product.

Look for supplements from reputable manufacturers that provide clear labeling of anthocyanin content and adhere to good manufacturing practices (GMP).

Frequently asked questions

  • Are anthocyanins the same as antioxidants?
    Anthocyanins are a type of antioxidant polyphenol, but not all antioxidants are anthocyanins.
  • Can I get enough anthocyanins from food?
    Yes, consuming a diet rich in colorful fruits and vegetables is the best way to obtain anthocyanins naturally.
  • Are anthocyanin supplements effective?
    Evidence is limited and inconclusive regarding benefits from supplements; more research is needed.
  • Are anthocyanins safe to take daily?
    They are generally considered safe at amounts found in foods. Safety of high-dose supplements is not well studied.
  • Does the supplement form affect anthocyanin absorption?
    There is insufficient evidence to conclude that one supplement form is superior in bioavailability.

Evidence limitations

  • Absence of multiple large, well-controlled human clinical trials with consistent findings
  • Lack of official recommended intake and dosage standardization
  • Limited data on bioavailability and metabolism in humans
  • Insufficient safety and interaction data

References

Last reviewed

June 2024

Disclaimer: This content is for informational purposes only and does not constitute medical advice. Dietary supplements should not replace a balanced diet or medical treatment. Consult a healthcare professional before starting any new supplement, especially if pregnant, breastfeeding, having a medical condition, or taking medications.