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Cheng HL, Yen CC, Huang LW, Hu YC, Huang TC, Hsieh BS, Chang KL. Selenium Lessens Osteoarthritis by Protecting Articular Chondrocytes from Oxidative Damage through Nrf2 and NF-κB Pathways. Int J Mol Sci 2024; 25:2511. [PMID: 38473759 DOI: 10.3390/ijms25052511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Revised: 02/08/2024] [Accepted: 02/19/2024] [Indexed: 03/14/2024] Open
Abstract
Osteoarthritis (OA) causes joint pain and disability due to the abnormal production of inflammatory cytokines and reactive oxygen species (ROS) in chondrocytes, leading to cell death and cartilage matrix destruction. Selenium (Se) intake can protect cells against oxidative damage. It is still unknown whether Se supplementation is beneficial for OA. This study investigated the effects of Se on sodium iodoacetate (MIA)-imitated OA progress in human chondrocyte cell line (SW1353 cells) and rats. The results showed that 0.3 μM of Se treatment could protect SW1353 cells from MIA-induced damage by the Nrf2 pathway by promoting the gene expression of glutathione-synthesis-related enzymes such as the glutamate-cysteine ligase catalytic subunit, the glutamate-cysteine ligase modifier subunit, and glutathione synthetase. In addition, glutathione, superoxide dismutase, glutathione peroxidase, and glutathione reductase expressions are also elevated to eliminate excessive ROS production. Moreover, Se could downregulate NF-κB, leading to a decrease in cytokines, matrix proteases, and glycosaminoglycans. In the rats, MIA-induced cartilage loss was lessened after 2 weeks of Se supplementation by oral gavage; meanwhile, glutathione synthesis was increased, and the expressions of pro-inflammatory cytokines were decreased. These results suggest that Se intake is beneficial for OA due to its effects of decreasing cartilage loss by enhancing antioxidant capacity and reducing inflammation.
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Affiliation(s)
- Hsiao-Ling Cheng
- Department of Pharmacy, Kaohsiung Municipal Min-Sheng Hospital, Kaohsiung 802511, Taiwan
| | - Chia-Chi Yen
- Department of Orthopedics, Kaohsiung Municipal Min-Sheng Hospital, Kaohsiung 802511, Taiwan
| | - Li-Wen Huang
- Department of Medical Laboratory Science and Biotechnology, College of Health Sciences, Kaohsiung Medical University, Kaohsiung 807378, Taiwan
| | - Yu-Chen Hu
- Department of Biochemistry, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 807378, Taiwan
| | - Tzu-Ching Huang
- Department of Biochemistry, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 807378, Taiwan
| | - Bau-Shan Hsieh
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 807378, Taiwan
| | - Kee-Lung Chang
- Department of Biochemistry, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 807378, Taiwan
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 807378, Taiwan
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Branco V, Carvalho L, Barboza C, Mendes E, Cavaco A, Carvalho C. Selenium and Redox Enzyme Activity in Pregnant Women Exposed to Methylmercury. Antioxidants (Basel) 2022; 11:2291. [PMID: 36421477 PMCID: PMC9687717 DOI: 10.3390/antiox11112291] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 11/10/2022] [Accepted: 11/17/2022] [Indexed: 04/26/2024] Open
Abstract
Selenium (Se) is a micronutrient with essential physiological functions achieved through the production of selenoproteins. Adequate Se intake has health benefits and reduces mercury (Hg) toxicity, which is important due to its neurotoxicity. This study determined the Se status and redox enzyme, including selenoproteins', activity in pregnant women highly exposed to Hg (between 1 to 54 µg Hg/L blood) via fish consumption. A cross-sectional study enrolling 513 women between the first and third trimester of pregnancy from Madeira, Portugal was conducted, encompassing collection of blood and plasma samples. Samples were analyzed for total Se and Hg levels in whole blood and plasma, and plasma activity of redox-active proteins, such as glutathione peroxidase (GPx), thioredoxin reductase (TrxR) and thioredoxin (Trx). Enzyme activities were related to Se and Hg levels in blood. Se levels in whole blood (65.0 ± 13.1 µg/L) indicated this population had a sub-optimal Se status, which translated to low plasma GPx activity (69.7 ± 28.4 U/L). The activity of TrxR (12.3 ± 5.60 ng/mL) was not affected by the low Se levels. On the other hand, the decrease in Trx activity with an increase in Hg might be a good indicator to prevent fetal susceptibility.
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Affiliation(s)
- Vasco Branco
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Professor Gama Pinto, 1649-003 Lisbon, Portugal
- Centro de Investigação Interdisciplinar Egas Moniz (CiiEM), Instituto Universitário Egas Moniz (IUEM), Quinta da Granja, 2829-511 Monte de Caparica, Portugal
| | - Luís Carvalho
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Professor Gama Pinto, 1649-003 Lisbon, Portugal
| | - Cássia Barboza
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Professor Gama Pinto, 1649-003 Lisbon, Portugal
| | - Eduarda Mendes
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Professor Gama Pinto, 1649-003 Lisbon, Portugal
| | - Afonso Cavaco
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Professor Gama Pinto, 1649-003 Lisbon, Portugal
| | - Cristina Carvalho
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Av. Professor Gama Pinto, 1649-003 Lisbon, Portugal
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Hadrup N, Ravn-Haren G. Absorption, distribution, metabolism and excretion (ADME) of oral selenium from organic and inorganic sources: A review. J Trace Elem Med Biol 2021; 67:126801. [PMID: 34091241 DOI: 10.1016/j.jtemb.2021.126801] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Revised: 03/26/2021] [Accepted: 05/27/2021] [Indexed: 10/21/2022]
Abstract
BACKGROUND Selenium is a trace element traditionally ingested either in its organic form via food or in its inorganic form through nutritional supplements, while selenium formulated as nanoparticles is a putative long-acting alternative. To understand the physiology and toxicology of the different selenium formulations, it is important to determine how their selenium content is absorbed, distributed, metabolised and excreted; therefore, we reviewed their biokinetics following oral exposure. METHODS We retrieved and reviewed the literature on the absorption, distribution, metabolism, and excretion of oral exposure to different forms of selenium. RESULTS Selenium in both the organic form (containing carbon to selenium chemical bonds) and the inorganic form is absorbed into the blood in humans. The mean normal blood level of many studies was 139 μg/L. There are indications that selenium from organic sources is more bioavailable than selenium from inorganic sources. Selenium is distributed throughout the body, including in breast milk. The elimination of selenium mainly involves the faecal and urinary pathways, whereas breath, saliva and hair are minor contributors. Urinary metabolites include trimethylselenium ions, selenosugars and Se-methylselenoneine. CONCLUSION Selenium is absorbed to a high extent, and selenium from organic sources is more bioavailable than from inorganic sources. Selenium, as expected as an essential trace element, is distributed throughout the body. Selenium is extensively metabolised, and various excretion metabolites have been identified in both urine and breath, while some selenium is also excreted via faeces.
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Affiliation(s)
- Niels Hadrup
- The National Research Centre For The Working Environment, Lersø Park Alle 105, DK-2100, Denmark.
| | - Gitte Ravn-Haren
- National Food Institute, Technical University of Denmark, Kemitorvet, DK 2800 Kgs, Lyngby, Denmark.
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Øyen J, Aadland EK, Liaset B, Fjære E, Dahl L, Madsen L. Lean-seafood intake increases urinary iodine concentrations and plasma selenium levels: a randomized controlled trial with crossover design. Eur J Nutr 2020; 60:1679-1689. [PMID: 32856189 PMCID: PMC7987597 DOI: 10.1007/s00394-020-02366-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Accepted: 08/10/2020] [Indexed: 12/31/2022]
Abstract
PURPOSE Iodine deficiency due to insufficient nutritional intake is a public health challenge in several European countries, including Norway. Lean-seafood has a high iodine and arsenic (As) content and is a good source of selenium (Se). Evidence of a direct effect of increased intake of lean-seafood on iodine status is limited. The main aims were to determine the iodine status at baseline and to investigate possible dietary effects on urinary iodine concentration (UIC) after intervention with lean-seafood versus non-seafood. Plasma Se, and plasma and urinary As concentrations were also measured. METHODS A randomized controlled crossover study comprising two 4 weeks experimental periods with two balanced diets varied in main proteins (60% of total dietary proteins) of lean-seafood and non-seafood, separated by a 5 week washout period. RESULTS Twenty participants (7 males, 13 females) were included and the mean ± SD age was 50.6 ± 15.3 years for all participants. Fasting UIC was median (25th, 75th percentile) 70 (38, 110) and 79 (49, 94) µg/L in the lean-seafood and non-seafood intervention at baseline, respectively. UIC increased after 4 weeks of the lean-seafood intervention to 135 (110, 278) µg/L, but not after the non-seafood intervention [58 (33, 91) µg/L] (P diet-effect < 0.001). Fasting plasma Se increased in the lean-seafood intervention and decreased in the non-seafood intervention (P diet-effect = 0.001). Fasting urinary and plasma As increased in the lean-seafood intervention and was unchanged in the non-seafood intervention (P diet-effect < 0.001). CONCLUSION The participant's UIC was below the recommended median (100 µg/L) at baseline, but increased sufficiently after a 4 week intervention with lean-seafood.
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Affiliation(s)
- Jannike Øyen
- Institute of Marine Research, P.O. Box 1870 Nordnes, 5817, Bergen, Norway.
| | - Eli Kristin Aadland
- Institute of Marine Research, P.O. Box 1870 Nordnes, 5817, Bergen, Norway.,Department of Sport, Food and Natural Sciences, Western Norway University of Applied Science, Bergen, Norway
| | - Bjørn Liaset
- Institute of Marine Research, P.O. Box 1870 Nordnes, 5817, Bergen, Norway
| | - Even Fjære
- Institute of Marine Research, P.O. Box 1870 Nordnes, 5817, Bergen, Norway
| | - Lisbeth Dahl
- Institute of Marine Research, P.O. Box 1870 Nordnes, 5817, Bergen, Norway
| | - Lise Madsen
- Institute of Marine Research, P.O. Box 1870 Nordnes, 5817, Bergen, Norway.,Department of Biology, University of Copenhagen, Copenhagen, Denmark
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Hargreaves IP, Mantle D. Supplementation with selenium and coenzyme Q10 in critically ill patients. Br J Hosp Med (Lond) 2020; 80:589-593. [PMID: 31589506 DOI: 10.12968/hmed.2019.80.10.589] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Multiple organ dysfunction and resultant mortality in critically ill patients has been linked with impaired cellular energy supply and oxidative stress. Clinical studies supplementing selenium, on the basis of its role as a key cofactor of antioxidant enzymes, have reported variable outcomes in critically ill patients. However, the synergistic interaction between selenium and coenzyme Q10, which has essential roles in cellular energy supply and as an antioxidant, has not been considered in such studies. This article reviews the link between selenium and coenzyme Q10, and the potential role of their co-supplementation in critical illness.
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Affiliation(s)
- I P Hargreaves
- Senior Lecturer, School of Pharmacy, Liverpool John Moores University, Liverpool L3 3AF
| | - D Mantle
- Consultant, Pharma Nord (UK) Ltd, Morpeth, Newcastle
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Hadrup N, Ravn-Haren G. Acute human toxicity and mortality after selenium ingestion: A review. J Trace Elem Med Biol 2020; 58:126435. [PMID: 31775070 DOI: 10.1016/j.jtemb.2019.126435] [Citation(s) in RCA: 66] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Revised: 11/08/2019] [Accepted: 11/12/2019] [Indexed: 10/25/2022]
Abstract
BACKGROUND Although selenium is an essential element for humans, acute toxicity has been reported after high oral exposure. METHODS The published literature on the acute toxicity of oral selenium was gathered and reviewed. RESULTS Reported symptoms and signs include abdominal symptoms, such as vomiting, diarrhea, pain, and nausea, as well as garlic-like odor on the breath. In cases of severe toxicity, cardiac and pulmonary symptoms may develop and ultimately lead to mortality. Mortality has been described after the ingestion of gun bluing solutions, which often contain selenous acid among other potentially toxic substances. Mortality has also been reported after the ingestion of other forms of selenium. Ingested doses associated with mortality are in the range of 1-100 mg Se/kg body weight. Blood levels associated with mortality are above 300 μg Se/L (normal level: 100 μg/L), whereas urinary levels associated with the same endpoint are above170 μg Se/L (normal level: 20-90 μg/L). CONCLUSION The acute toxicity associated with oral selenium ingestion and the blood and urinary levels of selenium in different cases of poisonings were reviewed. Mortality is a risk of acute selenium poisoning. Concentrations of selenium in blood and urine samples in non-fatal cases are close to those observed in fatal cases.
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Affiliation(s)
- Niels Hadrup
- The National Research Centre For The Working Environment, Lersø Parkallé 105, DK 2100, København Ø, Denmark.
| | - Gitte Ravn-Haren
- National Food Institute, Technical University of Denmark, Kemitorvet, DK 2800 Kgs. Lyngby, Denmark.
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Diet composition and serum levels of selenium species: A cross-sectional study. Food Chem Toxicol 2018; 115:482-490. [PMID: 29621579 DOI: 10.1016/j.fct.2018.03.048] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Revised: 03/14/2018] [Accepted: 03/30/2018] [Indexed: 12/13/2022]
Abstract
Selenium is a trace element of both nutritional and toxicological interest, depending on its dose and chemical form. Diet is the primary source of exposure for most individuals. We sought to investigate the influence of food intake on serum levels of selenium species. Among fifty subjects randomly selected from a Northern Italian population, we assessed dietary habits using a validated semi-quantitative food frequency questionnaire. We also measured circulating levels of selenium species in serum using high pressure liquid chromatography associated with inductively-coupled plasma dynamic reaction cell mass spectrometer. Circulating levels of inorganic selenium, the most toxic selenium species, were positively associated with intake of fish, legumes and dry fruits, and inversely associated with intake of dairy products and mushrooms. Concerning the organic selenium species, selenoproteinP-bound selenium was inversely associated with intake of fish, fresh fruits, vegetables, and legumes, while selenocysteine-bound selenium positively associated with intake of fresh fruit, potato, legume and mushroom. In the present study, intakes of different foods were correlated with different types of selenium species. These results have important public health implications when assessing the nutritional and toxicological potential of diet composition with reference to selenium exposure.
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Lazo-Vélez MA, Chávez-Santoscoy A, Serna-Saldivar SO. Selenium-Enriched Breads and Their Benefits in Human Nutrition and Health as Affected by Agronomic, Milling, and Baking Factors. Cereal Chem 2015. [DOI: 10.1094/cchem-05-14-0110-rw] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Marco A. Lazo-Vélez
- Centro de Biotecnología–FEMSA, Escuela de Ingeniería y Ciencias, Tecnológico de Monterrey–Campus Monterrey, Av. Eugenio Garza Sada 2501 Sur, C.P. 64849, Monterrey, NL, Mexico
| | - Alejandra Chávez-Santoscoy
- Centro de Biotecnología–FEMSA, Escuela de Ingeniería y Ciencias, Tecnológico de Monterrey–Campus Monterrey, Av. Eugenio Garza Sada 2501 Sur, C.P. 64849, Monterrey, NL, Mexico
| | - Sergio O. Serna-Saldivar
- Centro de Biotecnología–FEMSA, Escuela de Ingeniería y Ciencias, Tecnológico de Monterrey–Campus Monterrey, Av. Eugenio Garza Sada 2501 Sur, C.P. 64849, Monterrey, NL, Mexico
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Bryszewska MA, Måge A. Determination of selenium and its compounds in marine organisms. J Trace Elem Med Biol 2015; 29:91-8. [PMID: 25468190 DOI: 10.1016/j.jtemb.2014.10.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Revised: 09/10/2014] [Accepted: 10/16/2014] [Indexed: 10/24/2022]
Abstract
In this study, we investigate the type and quantity of selenium compounds in fish and marine organisms, using ion-pair reversed phase LC–ICP-MS, developed and applied for the analysis of Atlantic cod, Atlantic salmon, Greenland halibut, Atlantic herring, blue mussel, common crab, scallop, calanus, and Euphasia super. Of the samples examined, the lowest level of selenium was found in farmed Atlantic salmon (0.17 mg Se kg(−1) dm). The total selenium extraction efficiency by phosphate buffer was 2.5 times higher in sea plankton and shellfish samples than in fish samples. Analysis of Se species in each hydrolysate obtained by proteolysis showed the presence of selenomethionine, which constituted 41.5% of the selenium compounds detected in hydrolysates of Atlantic herring and 98.4% of those in extracts of Atlantic salmon. Inorganic compounds, such as selenates and selenites, were detected mainly in sea plankton and shellfish samples (<0.13 mg Se kg(−1) wm), although no correlation was found between the presence of inorganic compounds and total selenium concentration. The accuracy of the total selenium determination was validated using a certified reference material (oyster tissue (NIST 1566b)). A lyophilised powder of cod (Gadus morhua) was used to validate speciation analysis, enzymatic hydrolysis of lyophilised powder of cod recovered 54 ± 6% of total selenium, and SeMet constituted 83.5 ± 5.28% of selenium detected in hydrolysates. The chromatographic detection limits were, respectively, 0.30 ng mL(−1), 0.43 ng mL(−1), 0.54 ng mL(−1), 0.55 ng mL(−1), 0.57 ng mL(−1) and 0.72 ng mL(−1) for selenate, selenomethionine, selenite, Se-methyl-selenocysteine, selenocystine and selenomethionine selenoxide.The data on selenium concentrations and speciation presented here could be useful in estimating levels of selenium intake by seafood consumption.
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Lewis RC, Meeker JD. Biomarkers of exposure to molybdenum and other metals in relation to testosterone among men from the United States National Health and Nutrition Examination Survey 2011-2012. Fertil Steril 2014; 103:172-8. [PMID: 25439796 DOI: 10.1016/j.fertnstert.2014.09.020] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Revised: 09/12/2014] [Accepted: 09/12/2014] [Indexed: 11/27/2022]
Abstract
OBJECTIVE To examine the potential associations between biomarkers of metal exposure and serum testosterone in men of reproductive age in the general US population. DESIGN Cross-sectional epidemiology study with adjustment for potential confounders. SETTING Not applicable. PATIENT(S) Men recruited in the United States National Health and Nutrition Examination Survey (NHANES). INTERVENTION(S) Metal concentrations measured in whole blood, urine, and/or serum samples collected from 484 men. MAIN OUTCOME MEASURE(S) Serum T concentration. RESULT(S) Concentrations of the metals were detected in 69%-100% of the samples. In adjusted analyses where metals were modeled as a continuous variable, we found significant inverse associations between urinary molybdenum and serum copper and serum T, whereas there were significant positive associations between blood lead and cadmium and serum T. When metals were categorized into quartiles, analyses for serum copper and blood lead and cadmium produced significant associations in the same direction as the continuous measures. A suggestive inverse association was observed between quartiles of urinary molybdenum and serum T, but the association was statistically significant when molybdenum was categorized into quintiles. Significant positive associations were also observed for quartiles of blood Se and serum Zn and serum T. CONCLUSION(S) These findings add to the limited human evidence that exposure to molybdenum and other metals is associated with altered T in men, which may have important implications for male health. More research is needed to confirm the findings of our study.
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Affiliation(s)
- Ryan C Lewis
- Department of Environmental Health Sciences, University of Michigan School of Public Health, Ann Arbor, Michigan
| | - John D Meeker
- Department of Environmental Health Sciences, University of Michigan School of Public Health, Ann Arbor, Michigan.
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Gudmundsdottir EY, Gunnarsdottir I, Thorlacius A, Reykdal O, Gunnlaugsdottir H, Thorsdottir I, Steingrimsdottir L. Blood selenium levels and contribution of food groups to selenium intake in adolescent girls in Iceland. Food Nutr Res 2012; 56:18476. [PMID: 22952457 PMCID: PMC3432477 DOI: 10.3402/fnr.v56i0.18476] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Revised: 07/19/2012] [Accepted: 08/12/2012] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND/OBJECTIVES Significant changes have been reported in dietary habits and food availability in Iceland that would be expected to compromise selenium intake and status, especially among young people. These include substantial decreases in the consumption of fish and milk, as well as the selenium content of imported wheat. The aim of this study was to assess selenium in the diet and whole blood of adolescent girls, as well as define the most important foods contributing to intake and blood concentrations of selenium. DESIGN The subjects were 96 randomly selected girls, aged 16-20, who answered a validated food frequency questionnaire (FFQ) for dietary assessment. Selenium intake from each food group was calculated in µg/day. Blood samples were collected for measurement of whole blood selenium. RESULTS Mean dietary selenium was 51±25 µg/day. Milk/dairy products, including cheese, contributed 36±14% of total dietary selenium; fish 18±12%; and bread/cereal products 13±6%. Mean whole blood selenium was 117±12 µg/l (range 90-208); nearly 90% of subjects were above the optimal level of 100 µg/l. Fish and bread/cereal products were the only foods significantly correlated with selenium in blood (r=0.32; P=0.002 and r=0.22; P=0.04, respectively) while no correlation was found with milk and dairy products in spite of their greater contribution to total selenium intake. CONCLUSION In this population of Icelandic adolescent girls, selenium intake and status seem acceptable. Judging from associations between intake and blood levels, fish and cereals may be the most important contributors to blood selenium.
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