Quick Summary

Copper bisglycinate is a chelated form of the trace mineral copper, which is essential for various physiological functions in the human body. While copper’s general roles and nutritional importance are well established, specific clinical data on copper bisglycinate—including its absorption, bioavailability, and potential benefits compared to other copper forms—are currently limited.

What Is It?

Copper bisglycinate consists of copper bound to two molecules of the amino acid glycine, forming a chelated complex designed to potentially improve stability and absorption. It is used as a dietary supplement source of copper, a vital trace element necessary for health. Copper itself is naturally found in many foods and plays a critical role in enzyme function and biological processes.

Main Functions in the Body

  • Copper acts as an essential cofactor in redox reactions involving various enzymes.
  • It supports iron metabolism by facilitating iron transport and incorporation into hemoglobin.
  • Copper is crucial for connective tissue formation, contributing to the synthesis of collagen and elastin.
  • It is involved in neuropeptide synthesis, which affects neurotransmission.
  • Copper supports immune function and helps maintain the health of the nervous and cardiovascular systems.

Recommended Intake and Upper Limit

The Recommended Dietary Allowance (RDA) for copper varies by age, sex, and life stage. For adults, the RDA is generally around 900 micrograms (0.9 mg) per day according to authoritative sources such as the U.S. National Institutes of Health (NIH) Office of Dietary Supplements.

The Tolerable Upper Intake Level (UL) for copper is approximately 10 milligrams (mg) per day for adults. Exceeding this level may increase the risk of adverse effects due to copper toxicity.

It is important to note that these intake values pertain to total copper consumption from all dietary and supplemental sources. Specific intake recommendations for copper bisglycinate as a unique form are not available.

Best Food Sources

  • Shellfish, especially oysters
  • Seeds and nuts
  • Whole-grain products
  • Organ meats such as liver
  • Dark leafy green vegetables

Deficiency: Causes, Symptoms and Risk Groups

Copper deficiency is uncommon but can occur under certain conditions. Risk groups include:

  • Individuals with malabsorption disorders (e.g., celiac disease, Crohn’s disease)
  • People on prolonged parenteral nutrition without copper supplementation
  • Those consuming excessive zinc supplements, which may interfere with copper absorption

Signs and symptoms of copper deficiency may involve:

  • Anemia (due to impaired iron metabolism)
  • Neutropenia (reduced white blood cell count)
  • Neurological symptoms such as numbness or difficulty walking
  • Bone abnormalities and osteoporosis-like effects

There is no specific data concerning copper bisglycinate and deficiency correction in humans at this time.

Supplement Forms

  • Copper bisglycinate (chelated copper)
  • Copper gluconate
  • Copper sulfate
  • Copper oxide

Copper bisglycinate is often marketed for its chelated status, which in other minerals may influence absorption; however, conclusive data comparing these forms are lacking.

Absorption and Bioavailability

Copper is primarily absorbed in the small intestine. Chelated forms like copper bisglycinate might exhibit different absorption profiles compared to inorganic salts (e.g., copper sulfate or oxide), potentially enhancing bioavailability. However, no definitive studies comparing copper bisglycinate’s absorption or bioavailability to other forms have been found in current evidence.

Factors such as the presence of dietary components and overall nutritional status can affect copper absorption, but no specific enhancers or inhibitors relevant uniquely to copper bisglycinate have been identified.

Potential Benefits: What Does the Evidence Say?

  • Correction of copper deficiency: Copper is an essential nutrient with a well-established physiological role in preventing deficiency-related conditions such as anemia and immune dysfunction. This benefit is based on strong evidence for copper generally but not from human clinical trials specifically using copper bisglycinate.

No direct evidence was found supporting clinical benefits of copper bisglycinate supplementation beyond general copper nutrition.

Side Effects and Toxicity

Excessive copper intake can lead to toxicity, although specific toxicity profiles for copper bisglycinate are not described in the literature reviewed.

Symptoms of copper toxicity may include nausea, vomiting, abdominal pain, and in severe cases, hepatic and renal damage.

Maintaining intake below the Tolerable Upper Intake Level (~10 mg/day for adults) is generally considered prudent to reduce risk of adverse effects.

Drug and Nutrient Interactions

The evidence reviewed did not provide specific data on interactions involving copper bisglycinate. However, general copper nutrition research notes that excessive zinc supplementation can impair copper absorption and potentially lead to deficiency. People using medications or supplements affecting mineral balance should consult healthcare providers for guidance.

Who Should Be Careful?

  • People with medical conditions such as kidney disease, thyroid disease, or iron overload disorders
  • Pregnant or breastfeeding women
  • Individuals on medications that might interact with copper metabolism

Because copper levels and tolerance vary, consulting a healthcare professional before beginning copper bisglycinate or any copper supplement is advisable.

Frequently Asked Questions

Is copper bisglycinate better absorbed than other copper forms?
There is currently no conclusive evidence to suggest that copper bisglycinate has superior absorption or bioavailability compared to other copper compounds.
Can copper bisglycinate prevent copper deficiency?
While copper is essential for preventing deficiency, no direct clinical trial evidence specifically supports copper bisglycinate for this purpose. Adequate dietary intake usually meets copper needs.
Are there any EU-authorized health claims for copper bisglycinate?
No authorized health claims by the European Union exist specifically for copper bisglycinate.
What happens if I take too much copper?
High copper intakes may cause gastrointestinal symptoms and, in severe cases, organ damage. Staying within recommended intake levels is important.
Can I get enough copper from food alone?
Most people consume sufficient copper from a varied diet including shellfish, nuts, whole grains, and vegetables.

Evidence Limitations

  • No human clinical trials or systematic reviews directly investigating copper bisglycinate were found.
  • Comparative bioavailability, safety, and efficacy data for copper bisglycinate versus other forms are lacking.
  • The current evidence base restricts firm conclusions regarding any specific advantages or unique risks of copper bisglycinate supplementation.

References

Disclaimer: This information is provided for educational purposes and should not replace professional medical advice. Individuals who are pregnant, breastfeeding, have existing medical conditions, or use prescription medications should consult a healthcare professional before starting any new supplement, including copper bisglycinate.

Last reviewed: June 2024