Selenium

An essential trace element that is primarily protective in its biological roles. Unlike most metals in this wiki, selenium's toxicological significance lies more in the consequences of its deficiency than its excess. Selenium is the backbone of the selenoproteome — a family of ~25 selenoproteins including glutathione peroxidases, thioredoxin reductases, and iodothyronine deiodinases — that collectively defend against oxidative stress, regulate thyroid hormone metabolism, and modulate immune function. Selenium depletion is among the most consistent metallomic findings across cancer, cardiovascular disease, inflammatory bowel disease, and neurodegeneration, positioning it as a critical node in the metal-microbe-disease landscape.

Chemical Properties and Forms

  • Metalloid (Group 16), incorporated into proteins as the amino acid selenocysteine (the "21st amino acid").
  • Key organic forms: selenomethionine (dietary, supplement), selenocysteine (in selenoproteins), methylselenocysteine.
  • Inorganic forms: selenite (SeO3 2-), selenate (SeO4 2-) — used in some supplements.
  • Narrow therapeutic window: deficiency below ~40 ug/day; toxicity (selenosis) above ~400 ug/day.
  • The thyroid gland contains the highest concentration of selenium per gram of any organ in the body [1].
  • IARC classification: Group 3 (not classifiable as carcinogenic to humans) — selenium and selenium compounds [2].

Biological Roles

Selenium's biological significance is mediated almost entirely through its incorporation into selenoproteins as selenocysteine. These proteins form the backbone of multiple defense and regulatory systems.

The Selenoproteome

SelenoproteinFunctionDisease Relevance
GPX1-4 (Glutathione peroxidases)Reduce H2O2 and lipid hydroperoxidesCancer, neurodegeneration, CKD
GPX4Specifically prevents membrane lipid peroxidationferroptosis — loss of GPX4 is the key trigger
GPX3Plasma-phase extracellular antioxidantFunctional Se status marker; decreased in fibromyalgia ([3])
TXNRD1/2 (Thioredoxin reductases)Maintain thioredoxin in reduced stateRedox signaling, cancer
DIO1/2/3 (Iodothyronine deiodinases)Convert T4 to T3 (DIO1/2) or inactivate T3 (DIO3)[[gut-thyroid-axisthyroid-hormone-metabolism]]
Selenoprotein P (SELENOP)Se transport and delivery; antioxidantPrimary Se status biomarker
Selenoprotein S (SELENOS)Anti-inflammatory; ER stress responseGenetic variants implicated in Hashimoto's susceptibility [4]

Core Biological Functions

  1. Antioxidant defense: GPX enzymes reduce H2O2 and lipid hydroperoxides; TrxR enzymes maintain the thioredoxin system — together they constitute the primary enzymatic antioxidant network [5].
  2. Anti-ferroptotic activity: GPX4 specifically prevents lipid peroxidation in membranes; its loss triggers ferroptotic cell death. This mechanism links selenium deficiency directly to iron-dependent cellular damage [6].
  3. Thyroid hormone activation: DIO1/2 convert inactive T4 to active T3; DIO3 inactivates T3 — Se status directly controls thyroid hormone bioavailability [1], [7].
  4. Immunomodulation: Se supports regulatory T cells and suppresses Th1/Th17 responses. Supplementation increases GPx3 and selenoprotein P1; decreases MDA (oxidative stress marker); modulates anti-TPO antibody production [8], [9].
  5. H2O2 clearance in thyroid: Thyroglobulin iodination by thyroid peroxidase (TPO) generates substantial H2O2 via DUOX1/2. GPx1, GPx3, and GPx4 neutralize this H2O2, protecting thyrocytes from oxidative damage. Without adequate selenium, thyroid tissue accumulates oxidative damage during normal hormone synthesis [4].

Dietary and Environmental Sources

Dietary Sources

  • Brazil nuts are the highest natural source of selenium (ranges vary widely with soil selenium, but can deliver >50 ug per nut).
  • Seafood, organ meats, eggs, and dairy products are reliable dietary sources.
  • Cereal selenium content varies geographically — soils in parts of China, Finland, New Zealand, and central Europe are Se-poor, creating population-level deficiency zones [1].
  • Fruit juices tested in Pakistan contained measurable selenium across all categories, though the primary concern in those samples was other metals (Ni, Pb, Fe) exceeding WHO limits [10].

Infant Exposure

  • Infant formula selenium concentration measured at 130 ug/kg in German market samples, well below the health-based guidance value [11].
  • Selenium in human milk decreases during SARS-CoV-2 infection: 0.5-fold reduction compared to prepandemic controls (p=0.0001), alongside reductions in iron, copper, and nickel [12].
  • Human milk selenium is part of the micronutrient layer of milk-mediated neonatal protection, complementing zinc, lactoferrin-iron handling, and HMOs [13].

Supplementation Forms

  • 200 ug/day selenomethionine is the most commonly used dose in clinical trials [1].
  • Combined selenomethionine + myoinositol has been tested in autoimmune thyroid disease trials [8].
  • The optimal selenium form (selenomethionine vs. sodium selenite vs. Se-enriched yeast) remains an open question across disease contexts.

Other Exposure Routes

  • Tampons: Se detected in 98.3% of samples tested, representing an underrecognized mucosal exposure route [14].

Microbiome Interactions

This is where WikiBiome's coverage departs most significantly from conventional selenium literature. The selenium-microbiome axis is bidirectional: selenium status shapes microbial communities, and gut bacteria influence selenium bioavailability and metabolism.

Selenium Shapes Gut Microbial Diversity

  • Infant gut diversity: In a prospective cohort of 146 mother-infant pairs, Shannon diversity in 3-month-old infants correlated positively with maternal selenium exposure (measured in hair) and negatively with copper — suggesting selenium promotes a more diverse early-life microbial ecosystem [15], [16].
  • This stands in contrast to toxic metals such as copper and arsenic, which at high levels enriched antibiotic resistance genes and drove dysbiosis in the same cohort [15].

Selenium Protects Against Metal-Induced Dysbiosis

  • Mercury antagonism: Selenium directly antagonizes mercury toxicity and protects gut microbiota from mercury-induced compositional disruption. The Se-Hg binding complex is biologically inert, and the Se:Hg molar ratio determines net toxicity [17], [1].
  • Selenoprotein protection: Selenium-dependent selenoproteins (GPX, TrxR) protect against the oxidative stress cascade generated by toxic metals (cadmium, lead, arsenic, mercury), which deplete glutathione through direct thiol binding [5]. Selenium supplementation can partially restore antioxidant capacity in metal-exposed populations [18].
  • Cadmium antagonism: Selenium binds cadmium and facilitates biliary excretion, reducing cadmium's half-life in tissues. The cadmium-selenium antagonistic interaction in pregnant women is a developing research area with implications for developmental protection [19], [1].

Mercury Disrupts Selenoprotein Function

The selenium-mercury interaction deserves special attention because mercury toxicity operates substantially through selenium biology. Mercury (Hg2+ and methylmercury) binds selenocysteine active sites in GPX and TrxR with higher affinity than these enzymes bind their native selenium, effectively displacing selenium and disabling the entire selenoproteome [5]. This means mercury toxicity is not merely additive with selenium deficiency — it is mechanistically dependent on selenoprotein disruption. An individual with adequate selenium may tolerate higher mercury exposure because the selenoprotein reserve buffers against displacement, while a selenium-deficient individual is acutely vulnerable.

Gut Microbiota Influence Selenium Metabolism

  • Gut bacteria participate in selenium absorption, biotransformation, and recycling. The bidirectional relationship between gut microbiota and essential metals including selenium is well established — gut bacteria modulate pH, oxidative balance, and detoxification enzyme activity, all of which influence selenium bioavailability [20].
  • In the thyroid-gut axis, gut microbiota influence selenium utilization for thyroid hormone synthesis. Bacterial dysbiosis may impair selenium absorption, contributing to the selenium and other micronutrient deficiencies observed in hashimotos thyroiditis [21], [22], [23].

Probiotic-Selenium Synergy

  • In an RCT of 152 occupational metal workers, probiotic yogurt containing Pediococcus acidilactici GR-1 reduced blood copper (34.45%) and nickel (38.34%) after 12 weeks. Enriched Blautia and Bifidobacterium abundance correlated positively with antioxidant capacity, demonstrating that selenium-probiotic co-supplementation could further enhance protection against heavy metal-driven dysbiosis [24].

Nutritional Immunity

Selenium occupies an unusual position in the nutritional immunity framework. Unlike iron, zinc, manganese, and nickel — which are actively sequestered by the host to starve pathogens — selenium does not appear to function as a direct antimicrobial withholding metal. Instead, selenium supports immune function indirectly through selenoprotein-dependent pathways:

  • Th1/Th2/Treg balance: Selenium deficiency skews immune responses. Mice on high-Se diets showed increased T cell receptor signaling in CD4+ T cells and shifted balance toward Th1 phenotype. In humans, Se supplementation increases Tregs and reduces Foxp3 deficiency [9].
  • Anti-inflammatory selenoproteins: Selenoprotein S (SELENOS) is a key anti-inflammatory protein in the ER stress response. Genetic variants in SELENOS are implicated in Hashimoto's thyroiditis susceptibility [4].
  • Magnesium-selenium interaction: Magnesium modulates selenium bioavailability and tissue distribution, indirectly supporting T4-to-T3 conversion as a cofactor for deiodinases. Serum Mg <0.55 mmol/L is associated with higher TgAb positivity [9].

Conditions Associated

Thyroid Autoimmunity

The selenium-thyroid axis is among the most clinically significant and well-evidenced associations in trace element medicine.

Hashimoto's thyroiditis:

  • Se levels are significantly lower in HT patients (104.36 ug/l) and GD patients (97.68 ug/l) compared to controls (122.63 ug/l, P<0.001) [9].
  • Network meta-analysis of 7 RCTs: Selenium supplementation (200 ug/day selenomethionine) significantly reduced TPOAb (SMD -2.44, 95% CI -4.19 to -0.69) and TgAb (SMD -2.76, 95% CI -4.50 to -1.02) in euthyroid Hashimoto's patients. A 6-month treatment duration was required for detectable effects; 3-month studies were insufficient [25].
  • A separate meta-analysis confirmed Se supplementation reduced FT3 (MD=-0.40, P=0.009), FT4 (MD=-0.76, P=0.07), and TPOAb (MD=-150.25, P<0.00001) [9].
  • Se monotherapy (83 ug/day selenomethionine, 196 patients, 4 months) normalized TSH in 17.2% of subjects [9].
  • Combined selenomethionine + myoinositol reduced TSH, TPOAb, and TgAb after 6 and 12 months [8].
  • Se is essential for GPx-mediated H2O2 clearance during thyroglobulin iodination; selenoprotein S genetic variants are implicated in HT risk [4].
  • Greatest antibody reduction (40%) seen in those with anti-TPO >1200 IU/mL [1].

Graves' disease and ophthalmopathy:

  • GD patients with ophthalmopathy have even lower Se (96.82 ug/dL) than GD patients without (94.53 ug/dL) vs. controls (102.55 ug/dL) [9].
  • Double-blind RCT: 200 ug Se/day for 6 months significantly decreased GO severity, improved quality of life; benefits persisted after withdrawal [1].
  • Se deficiency is an independent risk factor for Graves' ophthalmopathy [1].

Pregnancy:

  • Selenomethionine 200 ug/day during pregnancy and postpartum decreased risk of permanent hypothyroidism and postpartum thyroiditis [1].
  • The iodine-selenium interaction is clinically important: in combined Se and iodine deficiency, normalizing Se without iodine worsens hypothyroidism; Se co-administration maintains GPx function during iodine repletion [1].

Hashimoto's and thyroid cancer:

  • In a meta-analysis of 65 studies (n=47,237), coexisting HT in papillary thyroid carcinoma (PTC) patients was associated with lower risk of lymph node metastasis (OR 0.787), distant metastasis (OR 0.435), and better 20-year survival (OR 1.396). Selenium status is a candidate mediator of this protective effect, alongside the immune microenvironment created by HT lymphocytic infiltration [26].

Cancer

Selenium depletion is one of the most consistent findings across cancer metallomic studies.

  • Pan-cancer metallomic pattern: Se tends to decrease across cancer types in blood/serum/plasma, alongside Cu elevation and Zn depletion. Selenoprotein gene variants (GPX1, GPX4, TXNRD1/2) are associated with cancer risk and susceptibility [27].
  • Prostate cancer: Se significantly decreased (0.07 vs 0.13 ug/ml, p<0.005); low Se correlates with carcinogenesis risk through impaired antioxidant defense [28].
  • Hepatocellular carcinoma: In non-cirrhotic HCC, tumor tissue shows metal depletion relative to non-tumoral liver for most elements including selenium, suggesting cancer cells systematically modulate their metal metabolism. Se concentration in tumor tissue was associated with extended survival only in the Peruvian cohort (above 1.48 ug/g: mean survival 323 weeks vs. 50 weeks below threshold, p=0.048) [29].
  • Lung cancer/COPD: Se elevated 1.23-fold in the COPD-to-lung-cancer transition group vs. healthy controls; the normally strong Zn-Se correlation (rho=0.69) is disrupted in disease states [30].
  • Breast cancer: Decreased Se reported in multiple metallomic studies alongside elevated Cu [27]. However, a large prospective study (Sister Study, n=1,495 cases) using toenail biomarkers found little evidence for individual metal-breast cancer associations; the authors note toenail Se reflects longer-term exposure (6-12 months) which may explain discrepancies with blood/serum studies [31].
  • Cadmium-selenium interaction in breast cancer: Selenium may have a modified protective effect against cadmium-driven breast carcinogenesis, where cadmium acts as a metalloestrogen by binding ERa (Kd = 4.5x10^-10 M) [32].

Cardiovascular Disease

  • Se decreased in AMI patients (90.31 vs. 99.98 ng/mL, p<0.01), with persistent depression at 6 months post-event [33].
  • Cu/Se ratio increased in AMI and showed significant longitudinal trajectory; identified as one of the most specific AMI biomarkers. A 10-feature random forest model incorporating metallomic ratios (Cu/Se, Fe/Cu) with traditional risk factors achieved AUC 0.942 [33].
  • Cu elevated and Se decreased represents a consistent cardiovascular risk metallomic signature [33].

Inflammatory Bowel Disease

  • In a Greek cross-sectional study (76 CD + 39 UC + 38 HC), plasma selenium was significantly lower in both Crohn's disease (50 ug/L) and ulcerative colitis (44 ug/L) compared to healthy controls (77 ug/L, p=0.009) [34].
  • Manganese, zinc, and strontium were also depleted in IBD, while nickel was elevated in active Crohn's disease [34].
  • The selenium depletion in IBD parallels findings across autoimmune conditions and may reflect both malabsorption from inflamed gut epithelium and increased antioxidant demand from chronic inflammation.

Neurodegeneration

  • Selenium deficiency is associated with increased neurodegeneration risk; some studies suggest Se supplementation may have neuroprotective effects [35].
  • In dementia with Lewy bodies (DLB), Se deficiency in primary visual cortex may compound effects of Cu loss by impairing GPx and TrxR activity [36].
  • Se's role in GPX4 directly connects to ferroptosis resistance in neurons — the same pathway implicated in Parkinson's disease dopaminergic neuron death. Iron accumulation in the substantia nigra catalyzes Fenton reactions driving lipid peroxidation; GPX4 downregulation removes the brake on ferroptotic cell death [6].
  • A systematic review of 8 studies (n=1,828,126) found significant correlation between cadmium and mercury exposure and deleterious neurocognitive outcomes in adults. The selenium-mercury interaction is relevant here: Hg displaces Se from selenocysteine active sites, and adequate Se status may buffer against Hg-driven cognitive decline [37].

Kidney Function

  • In a prospective Swiss cohort (n=4,704, mean follow-up 12.5 years), urinary selenium was associated with increased risk of incident impaired kidney function or CKD (HR 1.48). This paradoxical finding — an essential protective element associated with kidney risk — likely reflects that urinary Se is a marker of renal filtration dynamics rather than Se toxicity per se [38].

PCOS

  • A systematic review of 15 studies found that Se supplementation shows potential benefits for reducing oxidative stress and improving endocrinological parameters in PCOS women [39].
  • However, a Slovenian case-control study (n=70) found no significant differences in selenium between PCOS and control groups, contrasting with the consistent Cu elevation and novel Mo depletion observed in the same cohort [40].

Fibromyalgia

  • In a multi-omics study (199 FM patients + 43 controls), GPX3 (selenium-dependent glutathione peroxidase-3) was decreased to 0.85-fold in fibromyalgia plasma, alongside 2.05-fold elevation of zinc-alpha-2-glycoprotein (ZA2G). This links FM to impaired selenium-dependent antioxidant capacity [3].
  • A Mendelian randomization study (n>400,000) found no significant causal association for selenium and FM risk, though copper was positively associated and iron inversely associated [41].

COVID-19 and Long COVID

  • SARS-CoV-2 infection reduces selenium in human milk by approximately 50% compared to prepandemic controls (p=0.0001). The Se/Zn ratio was also significantly reduced, contrasting with the unique increase in zinc [12].
  • Higher anti-SARS-CoV-2 IgA levels were associated with lower Se and Co in milk [12].
  • Long COVID with ME/CFS phenotype shows metabolomic signatures consistent with mitochondrial dysfunction and glutathione depletion — patterns that implicate selenium-dependent antioxidant defenses [42].

Postpartum Depression

  • Selenium deficiency is among the micronutrient deficiencies associated with PPD through psychoneuroimmunological mechanisms [43], [44].
  • In a prospective cohort (Project Viva, n=1,226), erythrocyte selenium showed weak evidence of association with elevated depressive symptoms (OR 2.09 for elevated-then-decreasing trajectory, 95% CI: 0.74-5.94), though the overall metal mixture was not significantly associated [45].

Autism Spectrum Disorder

  • In a hair element study of 181 children (57 controls, 53 mild-moderate ASD, 71 severe ASD), no significant differences in selenium, zinc, iron, or magnesium were found between groups — though heavy metals (V, Co, Ni, As, Cd, Pb) were significantly elevated in severe ASD [46].
  • In a meta-analysis of two enriched-risk pregnancy cohorts (n=401), prenatal selenium was not consistently associated with ASD risk, though cadmium above detection level was associated with 1.69x higher ASD risk [47].

Environmental and Thyroid Disruption

  • Heavy metals (As, Cd, Cr, Hg, Ni, Pb) have never been systematically tested as potential human thyroid carcinogens, despite growing circumstantial evidence. Links between thyroid volume and Cr, Se, Zn in hair samples of children have been documented [48].
  • The 1.1% annual increase in thyroid disorders may reflect cumulative environmental metal exposure alongside endocrine disruptors [48].

Interactions with Other Metals

Mercury (Se-Hg Antagonism)

The selenium-mercury interaction is the most mechanistically characterized protective metal-metal relationship in human biology. Mercury binds selenocysteine active sites with higher affinity than the native selenium-protein bond, effectively hijacking the entire selenoproteome. This means:

  • Hg displaces Se from GPX and TrxR, disabling antioxidant defense [5].
  • Se-Hg complexes are biologically inert and facilitate mercury excretion [1].
  • The Se:Hg molar ratio determines net toxicity — adequate selenium creates a buffer zone.
  • No effective chelator exists for methylmercury in the brain; selenium supplementation may be partially protective by forming inert Hg-Se complexes [5].

Iron (Se-Fe Cooperation via GPX4)

Selenium and iron cooperate through GPX4: Se provides the enzyme, Fe homeostasis determines the substrate (lipid peroxides from Fenton chemistry). Se deficiency amplifies iron-driven ferroptosis. In Parkinson's disease, this axis is critical — iron accumulates in the substantia nigra while GPX4 is downregulated, creating a convergent vulnerability [6].

Copper (Cu/Se Ratio as Biomarker)

Cu/Se ratio is emerging as a multi-disease biomarker. Cu elevation + Se depletion is a consistent pathological signature:

  • In AMI: Cu/Se ratio increased with significant longitudinal trajectory [33].
  • In cancer: Cu elevated and Se decreased is a pan-cancer metallomic pattern [27].
  • In COVID-19 milk: Se/Zn ratio significantly reduced while Cu decreased separately — tissue-specific metal regulation during infection [12].
  • Cu/Se ratio may be more clinically relevant than absolute Cu concentration in autoimmune thyroid disease [9].

Zinc (Zn-Se Correlation)

Zn-Se correlation (rho=0.69) in healthy subjects is disrupted in lung cancer and COPD-LC, reflecting systemic metal dyshomeostasis [30]. Both elements are typically co-depleted in IBD and autoimmune disease.

Cadmium (Se-Cd Protection)

Se binding facilitates Cd biliary excretion, reducing tissue cadmium burden [1]. The antagonistic interaction is particularly relevant in pregnancy, where cadmium crosses the placenta and selenium may provide developmental protection [19]. Selenium may also modify the protective effect against cadmium's metalloestrogen activity in breast tissue [32].

Iodine (Two-Way Relationship)

Se protects against both iodine excess and deficiency in the thyroid. Combined Se+I deficiency requires careful sequential repletion — normalizing Se without iodine worsens hypothyroidism [1]. Iodine has a U-shaped dose-response relationship with autoimmune thyroid disease: excess iodine directly inhibits TPO activity, induces ROS, and promotes Th17 proliferation — all effects that adequate selenium buffers against [9], [4].

Magnesium

Mg modulates Se bioavailability and tissue distribution; indirectly supports T4-to-T3 conversion as a cofactor for deiodinases [9].

Biomarkers

BiomarkerWhat it measuresClinical context
Plasma/serum SeTotal circulating seleniumDecreased in AMI (persistent at 6 months), prostate cancer, IBD, and other malignancies [33], [28], [34]
Cu/Se ratioOxidative stress balanceElevated in AMI; tracks longitudinally; incorporated into a 10-feature random forest model achieving AUC 0.942 [33]
Selenoprotein PFunctional Se statusReflects Se available for selenoprotein synthesis rather than total Se
GPX3 activitySe-dependent extracellular antioxidant capacityDecreased to 0.85-fold in fibromyalgia [3]; functional marker in AITD [8]
Anti-TPO antibodiesThyroid autoimmune responseResponse to Se supplementation serves as clinical endpoint in thyroid autoimmunity trials (SMD -2.44 reduction) [25]
Urinary SeRenal Se handlingAssociated with kidney function decline in prospective studies (HR 1.48), likely reflecting filtration dynamics [38]
Hair SeChronic Se exposureUsed in prenatal/maternal studies; correlates with infant gut microbial diversity [15]

Key Studies

  • Peng 2024: Network meta-analysis of 10 RCTs establishing Se as the most effective supplement for reducing TPOAb and TgAb in euthyroid Hashimoto's patients, requiring 6-month treatment duration [25].
  • Lim 2023: Prospective plasma metallomics study identifying Cu/Se ratio as a longitudinal AMI biomarker within a 10-feature model achieving AUC 0.942 [33].
  • Cano 2021: Tissue metallomics of HCC demonstrating tumor Se concentration predicts survival in Peruvian cohort (323 vs. 50 weeks) [29].
  • Xiong 2025: Nature Communications study demonstrating maternal Se exposure positively correlates with infant gut microbial diversity — first direct evidence linking selenium to early-life microbiome development [15].
  • Amerikanou 2022: Cross-sectional study quantifying Se depletion in both CD (50 ug/L) and UC (44 ug/L) vs. controls (77 ug/L, p=0.009) [34].
  • Duran-Gonzalez 2025: Multi-omics fibromyalgia study identifying GPX3 (Se-dependent) as a depressed protein biomarker alongside zinc-alpha-2-glycoprotein [3].

Open Questions

  • Whether population-level Se supplementation in Se-poor regions could reduce thyroid autoimmunity, cardiovascular events, and cancer incidence simultaneously.
  • The optimal form and dose of Se supplementation across different disease contexts (selenomethionine vs. selenite vs. Se-enriched yeast).
  • Why Se depletion is so consistently observed across cancer types — is it cause (impaired antioxidant defense enabling carcinogenesis) or consequence (tumor Se consumption)?
  • How selenoprotein gene polymorphisms (GPX1, GPX4, TXNRD) modify individual cancer susceptibility and treatment response.
  • Whether Se supplementation could enhance ferroptosis-based cancer therapies by selectively protecting normal cells while allowing tumor cell death.
  • The mechanism by which selenium positively correlates with infant gut microbial diversity — is it through maternal selenoprotein activity, direct luminal effects, or breast milk composition?
  • Whether selenium-microbiome-thyroid interactions represent a single causal pathway or parallel independent effects.
  • How selenium status interacts with cadmium body burden during pregnancy to influence both developmental outcomes and infant microbiome colonization.
  • Whether the Cu/Se ratio should be standardized as a clinical biomarker across cardiovascular, oncological, and autoimmune contexts.

Cross-References

  • ferroptosis — GPX4 is the master regulator; Se deficiency enables ferroptotic cell death
  • hashimotos thyroiditis — 200 ug Se reduces anti-TPO antibodies (meta-analysis: SMD -2.44)
  • graves disease — Se deficiency as independent risk factor for ophthalmopathy
  • iron — Se-Fe cooperation through GPX4; Se deficiency amplifies iron-driven oxidative damage
  • copper — Cu/Se ratio as cardiovascular, cancer, and autoimmune biomarker
  • cadmium — Se facilitates Cd detoxification via biliary excretion; antagonistic interaction in pregnancy
  • mercury — Se-Hg binding provides protective effects; Hg hijacks selenoprotein active sites
  • zinc — Zn-Se correlation disrupted in disease states; co-depletion in IBD and autoimmunity
  • iodine — Two-way thyroid relationship; combined Se+I deficiency requires careful repletion
  • oxidative stress — selenoproteins are the primary enzymatic antioxidant network
  • metallomics — Se as key element in metallomic profiling of cancer, CVD, IBD, and neurodegeneration
  • nutritional immunity — Se supports immune function via selenoproteins rather than direct metal withholding
  • gut metal microbiome — bidirectional Se-microbiome interactions shape both microbial ecology and Se bioavailability
  • inflammatory bowel disease — Se depletion in both CD and UC
  • postpartum depression — Se deficiency as modifiable PPD risk factor
  • fibromyalgia — GPX3 depletion as metallomic biomarker

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