Quick Summary
Manganese is an essential trace mineral important for normal body functions including metabolism, antioxidant defense, and bone formation. Manganese gluconate is a supplemental form of manganese.
What is it?
Manganese is a trace mineral that the body requires in small amounts for various physiological processes. It is naturally present in many foods and participates in several enzymatic reactions linked to metabolism and antioxidant defense. As a trace mineral, its dietary requirements are relatively low compared to major minerals, but it remains essential for health.
Main Functions in the Body
- Plays a role in metabolism of amino acids, cholesterol, glucose, and carbohydrates
- Integral component of the antioxidant enzyme manganese superoxide dismutase (MnSOD), which helps protect cells from oxidative stress
- Involved in bone formation and wound healing processes
Recommended Intake and Upper Limit
The Adequate Intake (AI) for manganese varies by age, sex, and life stage. For precise amounts, official guidance such as the National Institutes of Health Office of Dietary Supplements (NIH ODS) fact sheet should be consulted.
There is an established Tolerable Upper Intake Level (UL) to prevent potential toxicity associated with excessive manganese intake. Intakes above this level may increase the risk of adverse effects.
| NIH Office of Dietary Supplements: Manganese |
Best Food Sources
- Whole grains
- Nuts
- Legumes
- Leafy green vegetables
- Tea
Deficiency: Causes, Symptoms and Risk Groups
Clinical manganese deficiency is rare due to its widespread presence in foods. However, certain groups may be at risk, including:
- Individuals with inadequate dietary intake
- People with impaired absorption or metabolic disorders
Signs and symptoms of manganese deficiency may include:
- Poor growth
- Skeletal abnormalities
- Impaired glucose tolerance
Supplement Forms
Common forms of manganese used in supplements include:
- Manganese gluconate
- Manganese sulfate
- Manganese oxide
- Manganese picolinate
- Manganese citrate
Absorption and Bioavailability
Manganese absorption efficiency is generally low and can be influenced by various dietary factors.
- Potential enhancers: Some dietary components might enhance absorption, but evidence is not clearly established.
- Inhibitors: High iron intake can decrease manganese absorption. Phytates and calcium may also inhibit its absorption.
- Form differences: There is insufficient data comparing absorption of manganese gluconate specifically with other forms.
Potential Benefits: What Does the Evidence Say?
Manganese is established as an essential nutrient with strong evidence supporting its role in normal metabolic and antioxidant enzyme functions.
However, there is a lack of direct supplementation trials specifically focused on manganese gluconate, thus broader claims related to supplementation in healthy individuals should be viewed cautiously.
Side Effects and Toxicity
There are no commonly reported side effects at normal dietary levels. However, excessive manganese intake can lead to neurological symptoms and toxicity.
Exceeding the tolerable upper intake level may increase the risk of adverse effects, particularly neurotoxicity.
Individuals with liver disease may have impaired manganese excretion, which could increase toxicity risk.
Drug and Nutrient Interactions
Currently, there is no supplied evidence detailing specific drug interactions with manganese supplements.
Who Should Be Careful?
People who are pregnant, breastfeeding, have medical conditions such as liver disease, kidney disease, thyroid disease, or iron overload disorders, or those using medications should consult a healthcare professional before taking manganese supplements.
Frequently Asked Questions
- Can manganese supplementation help healthy individuals?
- At present, strong evidence supports manganese’s essential roles but does not confirm additional benefits from supplementation in healthy people beyond adequate dietary intake.
- What are the signs that I might have a manganese deficiency?
- Deficiency is rare but may include symptoms such as poor growth, skeletal issues, and impaired glucose tolerance, especially if dietary intake is insufficient or absorption issues exist.
- Is manganese toxicity common?
- Toxicity is uncommon but can occur with excessive intake, particularly from supplements or environmental exposure. Neurotoxicity risk is higher for individuals with liver impairment.
- Are all manganese supplement forms absorbed equally?
- There is limited data comparing absorption between supplement forms like manganese gluconate, sulfate, or oxide. More research is needed.
Evidence Limitations
- No direct clinical trial or supplementation evidence specific to manganese gluconate was found in the supplied data.
- Safety details for manganese supplementation forms other than general manganese are incomplete.
References
Disclaimer
This information is provided for educational purposes and does not constitute medical advice. The safety and efficacy of manganes supplementation depend on individual circumstances. People who are pregnant, breastfeeding, have medical conditions, or use medications should consult a qualified healthcare professional before starting any new supplement.
Last Reviewed
June 2024