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Vitamin- og mineral guiden

C-vitamin (ascorbinsyre)

C-vitamin (ascorbinsyre)C-vitamin kaldes også for ascorbinsyre og L-ascorbinsyre. De fleste dyr kan selv danne C-vitamin ved hjælp af en trinvis, enzymatisk omdannelse af glukose (druesukker), men mennesker, menneskeaber, marsvin (gnaver) og enkelte andre arter har mistet denne evne gennem evolutionen.
De største mængder C-vitamin findes i immunforsvarets hvide blodlegemer, bugspytkirtlen, testiklerne og æggestokkene.
C-vitaminet er vandopløseligt, og da det ikke kan deponeres i kroppen, behøver vi en regelmæssig indtagelse.
C-vitaminet ødelægges af lys, opvarmning, udkogning, dybfrost, konservering og lagring, herunder vinteropbevaring af grønsager og frugter.

Funktioner og betydning for

  • Dannelse af kollagen i bindevævet, som medvirker til:
  • Blodkars struktur
  • Stærke knogler og bruskvæv
  • Sundt tandkød og tænders styrke
  • Hudens struktur, teint, elasticitet og fugtighed
  • Energiomsætning og energiniveau
  • Binyrernes produktion af hormonerne adrenalin og noradrenalin, som spiller en afgørende rolle under fysisk og psykisk stress.
  • Optagelse af jern
  • Immunsystemet – også under og efter fysisk træning
  • Nervesystemet og mental balance
  • Gendannelse af den aktive form af E-vitamin
  • Antioxidant, der modvirker skader fra frie radikaler og oxidativ stress
  • Indgår i intracellulære redoxsystemer, (en slags regulering af elektroner), men den nærmere virkningsmekanisme kendes ikke
  • Reduktion af træthed og udmattelse

Mangler og dårlig udnyttelse forårsages af

  • Fysisk og psykisk stress
  • Tobaksrygning
  • Stort forbrug af alkohol og narkotiske stoffer
  • Oxidativ stress som følge af frie radikaler
  • For lidt mavesyre
  • P-piller og sovemedicin
  • Sukker. Det skyldes, at sukker og C-vitamin konkurrerer om de samme kanaler, der fører ind i cellerne. Jo højere sukkerindtaget er, jo mere kan virkningen af C-vitamin reduceres.

Mangelsymptomer

  • Kollagen og bindevævet får en løs struktur, som kan give mange symptomer. Herunder:
  • Blå mærker, blødende gummer, næseblod og dårlig sårheling. Tilstanden kaldes også subklinisk skørbug.
  • Skørbug er den klassiske mangelsygdom og yderste konsekvens af C-vitaminmangel i form af dødelige indre blødninger. Tidligere mest udbredt blandt søfolk og i ulande.

Desuden:

  • Træthed
  • Jernmangel
  • Nedsat modstandskraft og hyppige infektioner
  • Hjerte-karsygdomme. Ifølge Nobelpristageren Linus Pauling kan langvarige lave blodniveauer af C-vitamin føre til åreforkalkning.

Kilder

Især frugter og bær, men også grønsager som kål, peberfrugt, peberrod, spinat, hvidløg og krydderurter.

Acerola – tropisk frugt  1.300-1.700
Hyben 1.250
Peberfrugt 191
Rosenkål 90-150
Appelsiner  50

Anbefalet daglig tilførsel

Voksne 11 år og opefter: 80 mg
Børn 1-10 år: 40 mg

Syreneutrale tilskud

Salte af ascorbinsyre kaldes for ascorbater. De bruges også i syreneutrale tilskud, der indeholder natriumascorbat eller calciumascorbat. De syreneutrale tilskud er mere skånsomme for slimhinderne i mave-tarmkanalen.

Øget behov

  • Nævnte mangelsymptomer og lægemidler
  • Misbrug af tobak, alkohol og narkotiske stoffer
  • Oxidativ stress (fx læsioner, forbrændinger og betændelsestilstande)
  • Fysisk og psykisk stress
  • Overforbrug af sukker

Kontraindikationer ved tilskud

Forsigtighed anbefales ved:

  • Nedsat nyrefunktion og tendens til nyresten
  • Sygdomme, hvor der ophobes jern i kroppen
  • Diarre
  • Behandling med blodfortyndende medicin

Tal med lægen, hvis der er tvivl

Overdosering – bivirkninger

Symptomer på overdosering forekommer sjældent, da overskud udskilles gennem urinen. Indtagelse af mere end 2 gram daglig (især ren ascorbinsyre) kan medføre diarre, kvalme, blæreirritation og risiko for nyresten. Risikoen for nyresten af C-vitamin synes dog mest at være en teoretisk risiko, da nystenstilfælde som følge af ascorbinsyre ikke ses i praksis.

Syntetisk fremstilling og tilsætningsstof

Det er nemt at fremstille ascorbinsyre og ascorbater syntetisk. Forbindelserne anvendes især som C-vitamintilskud. I levnedsmiddelindustrien udnytter man stofferne som antioxidanter og harmløse konserveringsmidler, der skal forhindre harskning. De har E-nummer 300-304.

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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)14.6ms4.05KBParams/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`362μs4KBParams/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 ASC2.71ms4.81KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:166Copy
  • SELECT `alias` FROM `has_content` WHERE `id` = :id136μs1.31KBParams/components/com_content/src/Service/Router.php:168Copy
  • SELECT `alias` FROM `has_content` WHERE `id` = :id71μs1.31KBParams/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` END438μs2.38KBParams/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`1.06ms4KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT custom_data FROM has_extensions WHERE element = 'yootheme' AND folder = 'system' LIMIT 1114μs536B/templates/yootheme/packages/platform-joomla/src/Storage.php:30Copy
  • SELECT `language`,`id` FROM `has_menu` WHERE `home` = '1' AND `published` = 1 AND `client_id` = 0318μs704B/libraries/src/Language/Multilanguage.php:123Copy
  • SELECT `alias` FROM `has_content` WHERE `id` = :id121μs1.31KBParams/components/com_content/src/Service/Router.php:168Copy
  • SELECT `alias` FROM `has_content` WHERE `id` = :id69μs1.31KBParams/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 <= '2025-04-06 23:52:12') AND (c2.publish_down IS NULL OR c2.publish_down >= '2025-04-06 23:52:12') AND c2.state = 1352μs1.47KBParams/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`4.32ms280.34KBParams/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` = :id146μs1.38KBParams/libraries/src/Language/Associations.php:145Copy
  • SELECT `name`,`element` FROM `has_extensions` WHERE `type` = 'plugin' AND `folder` = 'finder' AND `enabled` = 1167μs640B/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)144μs584B/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 ASC351μs4.75KBParams/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)139μs584B/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` = 1139μs1.37KBParams/administrator/components/com_scheduler/src/Model/TasksModel.php:466Copy
  • SELECT `session_id` FROM `has_session` WHERE `session_id` = ?118μs1KBParams/libraries/vendor/joomla/session/src/Handler/DatabaseHandler.php:291Copy
  • UPDATE `has_session` SET `data` = ? , `time` = ? WHERE `session_id` = ?14.64ms592BParams/libraries/vendor/joomla/session/src/Handler/DatabaseHandler.php:318Copy