Definition and research guide
This page combines a MeSH definition, publication statistics and selected research abstracts. It is a starting point for reading the literature, not a medical textbook or a systematic evidence review.
Content available: 3 complete abstracts (626 words), 9 references. Full article text is not stored or reproduced here; follow the PMID, DOI or PMC links to read the original sources and their access terms.
Definition
Essential dietary elements or organic compounds that are required in only small quantities for normal physiologic processes to occur.
Definition: NLM Medical Subject Headings (MeSH) scope note (Public domain (U.S. National Library of Medicine); attribution requested). View the MeSH record.
Also known as: Micronutrient.
Where it fits in the MeSH classification
- Broader topics
- Physiological Effects of Drugs; Nutrients
- Narrower topics
- Trace Elements; Vitamins
Research landscape
PubMed indexes 75,434 records tagged with the MeSH heading “Micronutrients” (counts retrieved 2026-10-29). 16,622 of them (22.0%) were published from 2020 onward, and the busiest period so far is through 1999 with 26,608 records.
Reviews account for 12,007 records (15.9%) and meta-analyses for 1,198. Randomized controlled trials number 4,014 (5.3%) as a share of all records on the topic.
Show the data
| Period | Records |
|---|---|
| through 1999 | 26,608 |
| 2000-2009 | 11,556 |
| 2010-2019 | 20,648 |
| 2020 onward | 16,622 |
Publication-type chart data
| Type | Records | Share |
|---|---|---|
| Reviews | 12,007 | 15.9% |
| Meta-analyses | 1,198 | 1.6% |
| Randomized controlled trials | 4,014 | 5.3% |
Method: PubMed query "Micronutrients"[MeSH Terms] with publication-type and date filters, retrieved 2026-10-29.
Reading the evidence in pharmacology
Drug evidence builds in layers: laboratory pharmacology describes how a compound acts, pharmacokinetic studies describe how the body handles it, and randomized trials test whether it helps and what harms it causes. Post-marketing surveillance and observational studies reveal rarer adverse effects but cannot prove causation. This page is educational and is not a recommendation to start, stop or change any medicine; decisions about treatment belong with a qualified clinician.
Evidence from open-access studies
These open-access studies come from PubMed’s best-match results for this heading (papers whose main topic it is), ranked here by citation count, with one recent addition. Each abstract is reproduced in full under its recorded open licence so that you can read the authors’ own words. They illustrate the literature; they are not a systematic summary of it. Citation counts measure attention, not reliability or clinical benefit.
| Study / authors | Year | Source label / design | Europe PMC citations | Licence / source |
|---|---|---|---|---|
| Iron, the Essential Micronutrient: A Comprehensive Review of Regulatory Pathways of Iron Metabolism | 2025 | Review article Design not recorded in structured metadata | 5 | cc by PMID 41515226 · DOI · PMC12787992 |
| The Role of Zinc in Pediatric Respiratory Infections: Evidence from Clinical Trials and Real-World Studies | 2026 | Review article Design not recorded in structured metadata | 5 | cc by PMID 41754074 · DOI · PMC12943518 |
| Immunometabolic control of cytokine production by micronutrients in health, aging, and inflammation | 2026 | Review article Design not recorded in structured metadata | 4 | cc by PMID 42164494 · DOI · PMC13183526 |
Iron, the Essential Micronutrient: A Comprehensive Review of Regulatory Pathways of Iron Metabolism [1]
Abstract reading summary — source excerpts
- Opening excerpt
- Iron constitutes an essential micronutrient in living organisms.
- Closing excerpt
- Thus, this review provides an update on the possible regulatory pathways that play a role in iron regulation and may be potential therapeutic targets.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (201 words)
Iron constitutes an essential micronutrient in living organisms. All iron is absorbed into the body through dietary intake, except for exogenous therapeutic sources. Dietary iron is typically categorized as either heme or nonheme iron. Nonheme iron is essential for regulating iron in the body, as it exists in various forms, including soluble iron, storage iron within ferritin, and iron found in the catalytic centers of a wide range of proteins. Iron homeostasis is carefully managed to ensure that sufficient iron is available for critical biological processes while preventing the harmful effects that can arise from excess iron. The small peptide hormone hepcidin is the main regulator of iron homeostasis. Hepcidin and other iron regulatory molecules are regulated by various signaling pathways, such as IL-6/JAK-STAT, BMP/SMAD, and MAPK. Alterations in regulatory pathways may occur in response to iron accumulation or deficiency. Iron overload in the body can activate JAK/STAT, BMP/SMAD and MAPK pathways, leading to the initiation hepcidin synthesis. Conversely, in iron deficiency, as in hypoxic conditions or EPO-mediated signaling pathways, HAMP synthesis in the nucleus is reduced. Thus, this review provides an update on the possible regulatory pathways that play a role in iron regulation and may be potential therapeutic targets.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 41515226 · DOI · PMC12787992
The Role of Zinc in Pediatric Respiratory Infections: Evidence from Clinical Trials and Real-World Studies [2]
Abstract reading summary — source excerpts
- Opening excerpt
- Background/Objectives: Zinc is an essential trace element involved in multiple aspects of immune function, including epithelial barrier integrity, innate and adaptive immune responses, regulation of inflammation and oxidative stress.
- Closing excerpt
- Further well-designed trials are warranted to clarify optimal dosing, timing, and target populations.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (255 words)
Background/Objectives: Zinc is an essential trace element involved in multiple aspects of immune function, including epithelial barrier integrity, innate and adaptive immune responses, regulation of inflammation and oxidative stress. Zinc deficiency has been associated with increased susceptibility to infections, particularly in the pediatric population. This narrative review aims to summarize and discuss current evidence on the role of zinc in the prevention and management of pediatric respiratory infections. Methods: A comprehensive literature review was conducted including randomized controlled trials, real-world studies, and international guidelines published in recent years. Both zinc monotherapy and multicomponent dietary supplements containing zinc were considered. Results: Evidence consistently supports a preventive role of zinc supplementation in reducing the incidence and burden of respiratory infections, particularly in children with recurrent disease and in zinc-deficient populations. Zinc-containing multicomponent supplements demonstrated significant reductions in infection frequency and duration, alongside improved patient and parent-reported outcomes, with a favorable safety profile. In contrast, data on zinc as an adjunctive treatment during acute infections, especially severe pneumonia, are less consistent, with limited impact on major clinical outcomes. The effectiveness of zinc appears to be influenced by treatment duration, baseline nutritional status, and formulation. Conclusions: In conclusion, zinc may represent a valuable component of preventive immune-nutritional strategies for pediatric respiratory infections, especially when administered as part of multicomponent formulations and over prolonged periods. While its role in acute disease management remains uncertain, optimizing zinc status may contribute to reducing infection recurrence and overall disease burden. Further well-designed trials are warranted to clarify optimal dosing, timing, and target populations.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 41754074 · DOI · PMC12943518
Immunometabolic control of cytokine production by micronutrients in health, aging, and inflammation [3]
Abstract reading summary — source excerpts
- Opening excerpt
- Micronutrients serve as critical metabolic sensors and epigenetic regulators that orchestrate cytokine production through multiple overlapping signalling cascades, transcriptional networks, and cellular metabolic states.
- Closing excerpt
- This review compiles the integrated mechanistic frameworks linking micronutrient availability to immunometabolic checkpoints, with implications for nutritional immunotherapy in chronic inflammatory diseases and immune-senescence.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (170 words)
Micronutrients serve as critical metabolic sensors and epigenetic regulators that orchestrate cytokine production through multiple overlapping signalling cascades, transcriptional networks, and cellular metabolic states. This comprehensive review synthesizes recent research demonstrating that micronutrient status regulates cytokine biology at five hierarchical levels: (i) nutrient sensing via mTORC1/GCN2 and amino acid sensor networks; (ii) transcriptional control through VDR/RARα-mediated epigenetic remodelling and histone deacetylase inhibition; (iii) redox signalling via SELENOK/selenoprotein-stabilized calcium homeostasis and Nrf2/ARE pathway activation; (iv) Pyroptosis/ferroptosis execution via metallothionein-zinc-caspase axes and NLRP3/GSDMD regulation; and (v) metabolic bioenergetics through NAD+/CD38/SIRT-mediated immune cell differentiation and aging. Recent discoveries establish that vitamin D directly suppresses IL-22 through repressive VDREs independent aryl-hydrocarbon receptor (AhR) signalling, zinc-metallothionein-3 that suppresses non-canonical inflammasome activation via TRIF-IRF3-STAT1 modulation, selenium-dependent SELENOK which stabilizes IP3 receptor-mediated store-operated calcium entry in immune cells, and folate-dependent one-carbon metabolism generating S-adenosyl methionine (SAM) that tunes epigenetic landscapes of cytokine genes. This review compiles the integrated mechanistic frameworks linking micronutrient availability to immunometabolic checkpoints, with implications for nutritional immunotherapy in chronic inflammatory diseases and immune-senescence.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 42164494 · DOI · PMC13183526
Key reviews and meta-analyses
The most cited review-type papers among PubMed’s best-match results for this heading, listed with bibliographic details only. Follow the links for the full text and access terms.
- Research article ESPEN micronutrient guideline [4]
- Research article Association Between Calcium or Vitamin D Supplementation and Fracture Incidence in Community-Dwelling Older Adults: A Systematic Review and Meta-analysis [5]
- Research article Effects and safety of periconceptional oral folate supplementation for preventing birth defects [6]
- Research article Vitamin D supplementation and total cancer incidence and mortality: a meta-analysis of randomized controlled trials [7]
- Research article Multiple-micronutrient supplementation for women during pregnancy [8]
- Research article Vitamin D supplementation to prevent asthma exacerbations: a systematic review and meta-analysis of individual participant data [9]
References
- Horváth A, Tamási K, Pap R, Jánosa G, Pandur E. Iron, the Essential Micronutrient: A Comprehensive Review of Regulatory Pathways of Iron Metabolism. . 2025. PMID 41515226 · DOI · PMC12787992
- Dinardo G, Indolfi C, Klain A, Grella C, Tosca MA, Miraglia Del Giudice M, et al.. The Role of Zinc in Pediatric Respiratory Infections: Evidence from Clinical Trials and Real-World Studies. . 2026. PMID 41754074 · DOI · PMC12943518
- Ghosh J, Chattopadhyay D. Immunometabolic control of cytokine production by micronutrients in health, aging, and inflammation. . 2026. PMID 42164494 · DOI · PMC13183526
- Berger MM, Shenkin A, Schweinlin A, Schweinlin A, Amrein K, Augsburger M, et al.. ESPEN micronutrient guideline. Clin Nutr. 2022. PMID 35365361 · DOI
- Zhao JG, Zeng XT, Wang J, Liu L. Association Between Calcium or Vitamin D Supplementation and Fracture Incidence in Community-Dwelling Older Adults: A Systematic Review and Meta-analysis. JAMA. 2017. PMID 29279934 · DOI · PMC5820727
- De-Regil LM, Peña-Rosas JP, Fernández-Gaxiola AC, Rayco-Solon P. Effects and safety of periconceptional oral folate supplementation for preventing birth defects. Cochrane Database Syst Rev. 2015. PMID 26662928 · DOI · PMC8783750
- Keum N, Lee DH, Greenwood DC, Manson JE, Giovannucci E. Vitamin D supplementation and total cancer incidence and mortality: a meta-analysis of randomized controlled trials. Ann Oncol. 2019. PMID 30796437 · DOI · PMC6821324
- Keats EC, Haider BA, Tam E, Bhutta ZA. Multiple-micronutrient supplementation for women during pregnancy. Cochrane Database Syst Rev. 2019. PMID 30873598 · DOI · PMC6418471
- Jolliffe DA, Greenberg L, Hooper RL, Griffiths CJ, Camargo CA, Kerley CP, et al.. Vitamin D supplementation to prevent asthma exacerbations: a systematic review and meta-analysis of individual participant data. Lancet Respir Med. 2017. PMID 28986128 · DOI · PMC5693329
About this article
- Sources
- NLM Medical Subject Headings (definition, synonyms); NCBI PubMed (counts, identifiers); Europe PMC (open-access abstracts and citation counts).
- Verification
- Every reference was resolved against PubMed on 2026-10-31; title, year and DOI matched.
- Review state
- automated source verified; no human expert review has been recorded yet.
- Version
- 1, last updated 2026-10-29.
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Evidence strength
EvidenceHelix's computed view of the study designs behind this topic: how common meta-analyses, randomized trials and reviews are, how recent the literature is, and a plain-language reading. It describes the design mix of the literature. It is not a quality appraisal of any study, and it is not medical advice.