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Vitamin- og mineral guiden

B12 vitamin (cobalamin)

B12 vitamin (cobalamin)

B12 vitamin er betegnelsen for en gruppe kemisk beslægtede stoffer, der alle har vitaminaktivitet. De kaldes også cobalaminer. Biosyntesen af den grundlæggende struktur sker ved hjælp af bakterier, som findes mange steder i naturen.
Optagelsen af B12 vitamin fra kosten kræver proteinet intrinsic factor, der dannes i mavesækkens slimhinde. Intrinsic factor binder sig til B12 vitaminet og transporterer det ind i kroppen fra tyndtarmen.


Generelt er det vanskeligere at optage B12 vitaminet i forhold til andre vitaminer, og evnen forringes med alderen.
B12 vitamin lagres i leveren op til flere måneder, og vi kan også genbruge det B12 vitamin, som vi optager.
Colibakterier i tyktarmen producerer også B12 vitamin, men der er uenighed om optagelsen, da den som nævnt foregår i tyndtarmen og kræver bærestoffet intrinsic factor.
Under kogning og stegning af maden er det kun omkring 10 procent, som går tabt.
I tilskud og lægemidler er doserne ofte ret høje for at sikre en tilstrækkelig optagelse, og her findes B12 vitamin på forskellige former
Cyanocobalamin er syntetisk og indeholder cyanid, der er giftigt.
Methylcobalamin, som koster mere at fremstille, er ikke giftigt.

Funktioner og betydning for

  • Dannelsen af røde blodlegemer, der transporterer ilt rundt i kroppen
  • Energiniveau
  • Nervesystemet – vedligeholdelse og nydannelse
  • Mental balance
  • Immunsystemet
  • Omdannelse af aminosyren homocystein til methionin
  • Kroppens celledeling

Mangler og dårlig udnyttelse forårsages af

  • Manglende dannelse af intrinsic faktor, der er nødvendig for optagelse
  • Overforbrug af alkohol
  • Nedsat evne til at lagre vitaminet i leveren
  • Alderdom, især i kombination med ensidige kostvaner
  • Østrogen og p-piller
  • Sovepiller
  • Lang tid uden animalske fødevarer. Veganere og vegetarer er særlig udsatte
  • For lidt mavesyre og dårlig tarmflora
  • Fiskebændelorm (bændelorm fra ferskvandsfisk, der forbruger store mængder B12)
  • Kronisk betændelse i bugspytkirtlen
  • Længere tids brug af lægemidler som:
  • Salicylsyrepræparater mod kronisk tarmbetændelse (Asacol, Pentasa m.v.)
  • Kolesterolsænkende midler (kolestyramin og klofibrat)
  • Antibiotika
  • Isoniazid mod tuberkulose
  • Methotrexat mod gigt og kræft

Mangelsymptomer

Mangler er som regel længe om at udvikle sig, da vi kan genbruge vitaminet og lagre det i forholdsvis lang tid. Mangler kan både optræde i en lettere og sværere grad. Nogle får først symptomer fra nervesystemet, mens andre får symptomer på blodmangel.

  • Blodmangelsymptomer. De optræder fordi cellerne i hjernen, hjertet, musklerne med videre mangler blod og ilt. Herunder træthed, hjertebanken, åndenød, svimmelhed og i svære tilfælde hovedpine, hjertekrampe og smerter i benene (Claudicadio intermittens/vindueskiggersyge).

B12 vitaminmangel kan udvikler to former for blodmangel/anæmi.

  • Perniciøs anæmi grundet mangel på intrinsic faktor. Sygdommen er ofte genetisk betinget og skyldes autoimmune reaktioner. Behandling af perniciøs anæmi kræver indsprøjtning med vitaminet.
  • Megaloblastær anæmi, som også optræder ved folinsyremangel.

Der kan desuden optræde:

  • Rød og irriteret tunge
  • Nedsat smagssans
  • Fordøjelsesbesvær
  • Symptomer fra nervesystemet
  • Dårlig hukommelse, mental sløvhed og demens
  • Følelsesløshed i hænder og fødder på grund af nerveskade
  • Koordinationsbesvær med spastisk lammelse

Børn af mødre på ensidig eller vegetarisk kost risikerer at få B12 vitaminmangel, som kan medføre nedsat vækst, anæmi og i værste fald mental retardering.

Mangel på B12 vitamin optræder ofte sammen med mangel på folinsyre.

Blodprøver og diagnose

B12-vitaminmangel kan afsløres gennem en blodprøve.

Kilder

Især animalske kilder som lever, kød, fisk, æg og mejeriprodukter

Okselever/svinelever

110/40

Muslinger 10
Laks 6
Hele æg/kalkun 2
Ost 1,5

Anbefalet daglig tilførsel

Voksne 11 år og opefter: 2,5 mikrogram
Børn 1-10 år: 1 mikrogram
Gravide: Vegetarer og veganere bør tage tilskud.

Øget behov

  • Omtalte mangelsygdomme og lægemidler
  • Overforbrug af alkohol
  • Alderdom, især kombineret med ensidige kostvaner
  • Lang tid uden animalske produkter. Især veganere og vegetarer
  • P-piller

Ved perniciøs anæmi bør der gives indsprøjtninger

Vigtigt at vide

Tilskud bør som regel indtages med andre B-vitaminer og adskilt fra syreneutraliserende medicin.

Overdosering – bivirkninger

Der er ikke observeret bivirkninger ved selv store doser. Ved indsprøjtning i blodbanen kan der optræde en allergisk reaktion.

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  • SELECT `m`.`tag_id`,`t`.* FROM `has_contentitem_tag_map` AS `m` INNER JOIN `has_tags` AS `t` ON `m`.`tag_id` = `t`.`id` WHERE `m`.`type_alias` = :contentType AND `m`.`content_item_id` = :id AND `t`.`published` = 1 AND `t`.`access` IN (:preparedArray1,:preparedArray2) AND `language` IN (:preparedArray3,:preparedArray4)8.09ms4.06KBParams/libraries/src/Helper/TagsHelper.php:388Copy
  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `has_categories` AS `s` INNER JOIN `has_categories` AS `c` ON (`s`.`lft` < `c`.`lft` AND `c`.`lft` < `s`.`rgt` AND `c`.`language` IN (:preparedArray3,:preparedArray4)) OR (`c`.`lft` <= `s`.`lft` AND `s`.`rgt` <= `c`.`rgt`) WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1,:preparedArray2) AND `c`.`published` = 1 AND `s`.`id` = :id ORDER BY `c`.`lft`820μs4KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT DISTINCT a.id, a.title, a.name, a.checked_out, a.checked_out_time, a.note, a.state, a.access, a.created_time, a.created_user_id, a.ordering, a.language, a.fieldparams, a.params, a.type, a.default_value, a.context, a.group_id, a.label, a.description, a.required, a.only_use_in_subform,l.title AS language_title, l.image AS language_image,uc.name AS editor,ag.title AS access_level,ua.name AS author_name,g.title AS group_title, g.access as group_access, g.state AS group_state, g.note as group_note FROM has_fields AS a LEFT JOIN `has_languages` AS l ON l.lang_code = a.language LEFT JOIN has_users AS uc ON uc.id=a.checked_out LEFT JOIN has_viewlevels AS ag ON ag.id = a.access LEFT JOIN has_users AS ua ON ua.id = a.created_user_id LEFT JOIN has_fields_groups AS g ON g.id = a.group_id LEFT JOIN `has_fields_categories` AS fc ON fc.field_id = a.id WHERE ( (`a`.`context` = :context AND (`fc`.`category_id` IS NULL OR `fc`.`category_id` IN (:preparedArray1,:preparedArray2,:preparedArray3)) AND `a`.`access` IN (:preparedArray4,:preparedArray5)) AND (`a`.`group_id` = 0 OR `g`.`access` IN (:preparedArray6,:preparedArray7)) AND `a`.`state` = :state) AND (`a`.`group_id` = 0 OR `g`.`state` = :gstate) AND `a`.`only_use_in_subform` = :only_use_in_subform AND `a`.`language` IN (:preparedArray8,:preparedArray9) ORDER BY a.ordering ASC285μs4.81KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:166Copy
  • SELECT `alias` FROM `has_content` WHERE `id` = :id118μs1.31KBParams/components/com_content/src/Service/Router.php:168Copy
  • SELECT `alias` FROM `has_content` WHERE `id` = :id66μs1.31KBParams/components/com_content/src/Service/Router.php:168Copy
  • SELECT `a`.`id`,`a`.`title`,`a`.`catid`,`a`.`language`, CASE WHEN CHAR_LENGTH(`a`.`alias`) != 0 THEN CONCAT_WS(':', `a`.`id`, `a`.`alias`) ELSE a.id END AS `slug`, CASE WHEN CHAR_LENGTH(`cc`.`alias`) != 0 THEN CONCAT_WS(':', `cc`.`id`, `cc`.`alias`) ELSE cc.id END AS `catslug` FROM `has_content` AS `a` LEFT JOIN `has_categories` AS `cc` ON `cc`.`id` = `a`.`catid` WHERE `a`.`catid` = :catid AND `a`.`state` = :state AND `a`.`access` IN (:preparedArray1,:preparedArray2) AND (`publish_up` IS NULL OR `publish_up` <= :nowDate1) AND (`publish_down` IS NULL OR `publish_down` >= :nowDate2) AND `a`.`language` IN (:preparedArray3,:preparedArray4) ORDER BY CASE WHEN `a`.`publish_up` IS NULL THEN `a`.`created` ELSE `a`.`publish_up` END461μs2.38KBParams/plugins/content/pagenavigation/src/Extension/PageNavigation.php:188Copy
  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `has_categories` AS `s` INNER JOIN `has_categories` AS `c` ON (`s`.`lft` < `c`.`lft` AND `c`.`lft` < `s`.`rgt` AND `c`.`language` IN (:preparedArray3,:preparedArray4)) OR (`c`.`lft` <= `s`.`lft` AND `s`.`rgt` <= `c`.`rgt`) WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1,:preparedArray2) AND `c`.`published` = 1 AND `s`.`id` = :id ORDER BY `c`.`lft`2.48ms4KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT custom_data FROM has_extensions WHERE element = 'yootheme' AND folder = 'system' LIMIT 1116μs536B/templates/yootheme/packages/platform-joomla/src/Storage.php:30Copy
  • SELECT `language`,`id` FROM `has_menu` WHERE `home` = '1' AND `published` = 1 AND `client_id` = 01.82ms704B/libraries/src/Language/Multilanguage.php:123Copy
  • SELECT `alias` FROM `has_content` WHERE `id` = :id3.14ms1.31KBParams/components/com_content/src/Service/Router.php:168Copy
  • SELECT `alias` FROM `has_content` WHERE `id` = :id94μs1.31KBParams/components/com_content/src/Service/Router.php:168Copy
  • SELECT `c2`.`language`,CONCAT_WS(':', `c2`.`id`, `c2`.`alias`) AS `id`,CONCAT_WS(':', `ca`.`id`, `ca`.`alias`) AS `catid` FROM `has_content` AS `c` INNER JOIN `has_associations` AS `a` ON `a`.`id` = `c`.`id` AND `a`.`context` = :context INNER JOIN `has_associations` AS `a2` ON `a`.`key` = `a2`.`key` INNER JOIN `has_content` AS `c2` ON `a2`.`id` = `c2`.`id` INNER JOIN `has_categories` AS `ca` ON `c2`.`catid` = `ca`.`id` AND `ca`.`extension` = :extension2 WHERE `c`.`id` = :id AND c2.access IN (1,5) AND c2.language != 'da-DK' AND (c2.publish_up IS NULL OR c2.publish_up <= '2025-04-10 06:32:44') AND (c2.publish_down IS NULL OR c2.publish_down >= '2025-04-10 06:32:44') AND c2.state = 1713μs1.47KBParams/libraries/src/Language/Associations.php:145Copy
  • SELECT `m`.`id`,`m`.`title`,`m`.`module`,`m`.`position`,`m`.`content`,`m`.`showtitle`,`m`.`params`,`mm`.`menuid` FROM `has_modules` AS `m` LEFT JOIN `has_modules_menu` AS `mm` ON `mm`.`moduleid` = `m`.`id` LEFT JOIN `has_extensions` AS `e` ON `e`.`element` = `m`.`module` AND `e`.`client_id` = `m`.`client_id` WHERE ( ( (`m`.`published` = 1 AND `e`.`enabled` = 1 AND `m`.`client_id` = :clientId AND `m`.`access` IN (:preparedArray1,:preparedArray2)) AND (`m`.`publish_up` IS NULL OR `m`.`publish_up` <= :publishUp)) AND (`m`.`publish_down` IS NULL OR `m`.`publish_down` >= :publishDown)) AND (`mm`.`menuid` = :itemId OR `mm`.`menuid` <= 0) AND `m`.`language` IN (:preparedArray3,:preparedArray4) ORDER BY `m`.`position`,`m`.`ordering`5.53ms280.34KBParams/libraries/src/Cache/Controller/CallbackController.php:51Copy
  • SELECT `c2`.`language`,`c2`.`id` FROM `has_menu` AS `c` INNER JOIN `has_associations` AS `a` ON `a`.`id` = `c`.`id` AND `a`.`context` = :context INNER JOIN `has_associations` AS `a2` ON `a`.`key` = `a2`.`key` INNER JOIN `has_menu` AS `c2` ON `a2`.`id` = `c2`.`id` WHERE `c`.`id` = :id510μs1.38KBParams/libraries/src/Language/Associations.php:145Copy
  • SELECT `name`,`element` FROM `has_extensions` WHERE `type` = 'plugin' AND `folder` = 'finder' AND `enabled` = 1170μs640B/administrator/components/com_finder/src/Helper/LanguageHelper.php:135Copy
  • SELECT `title` FROM `has_finder_taxonomy` WHERE `parent_id` = 1 AND `state` = 1 AND `access` IN (1,5)2.95ms584B/administrator/components/com_finder/src/Indexer/Taxonomy.php:314Copy
  • SELECT DISTINCT a.id, a.title, a.name, a.checked_out, a.checked_out_time, a.note, a.state, a.access, a.created_time, a.created_user_id, a.ordering, a.language, a.fieldparams, a.params, a.type, a.default_value, a.context, a.group_id, a.label, a.description, a.required, a.only_use_in_subform,l.title AS language_title, l.image AS language_image,uc.name AS editor,ag.title AS access_level,ua.name AS author_name,g.title AS group_title, g.access as group_access, g.state AS group_state, g.note as group_note FROM has_fields AS a LEFT JOIN `has_languages` AS l ON l.lang_code = a.language LEFT JOIN has_users AS uc ON uc.id=a.checked_out LEFT JOIN has_viewlevels AS ag ON ag.id = a.access LEFT JOIN has_users AS ua ON ua.id = a.created_user_id LEFT JOIN has_fields_groups AS g ON g.id = a.group_id WHERE ( (`a`.`context` = :context AND `a`.`access` IN (:preparedArray1,:preparedArray2)) AND (`a`.`group_id` = 0 OR `g`.`access` IN (:preparedArray3,:preparedArray4)) AND `a`.`state` = :state) AND (`a`.`group_id` = 0 OR `g`.`state` = :gstate) AND `a`.`only_use_in_subform` = :only_use_in_subform AND `a`.`language` IN (:preparedArray5,:preparedArray6) ORDER BY a.ordering ASC295μs4.75KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:166Copy
  • SELECT `title` FROM `has_finder_taxonomy` WHERE `parent_id` = 1 AND `state` = 1 AND `access` IN (1,5)189μs584B/administrator/components/com_finder/src/Indexer/Taxonomy.php:314Copy
  • SELECT SUM(CASE WHEN `a`.`next_execution` <= :now THEN 1 ELSE 0 END) AS due_count,SUM(CASE WHEN `a`.`locked` IS NULL THEN 0 ELSE 1 END) AS locked_count FROM `has_scheduler_tasks` AS `a` WHERE `a`.`state` = 12.62ms1.37KBParams/administrator/components/com_scheduler/src/Model/TasksModel.php:466Copy
  • SELECT `session_id` FROM `has_session` WHERE `session_id` = ?1.85ms1KBParams/libraries/vendor/joomla/session/src/Handler/DatabaseHandler.php:291Copy
  • UPDATE `has_session` SET `data` = ? , `time` = ? WHERE `session_id` = ?5.87ms592BParams/libraries/vendor/joomla/session/src/Handler/DatabaseHandler.php:318Copy