ANSWER
According to Twelfth Schedule of Food Regulations 1985, the following iron are permitted to be added in food:
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Carbonyl iron
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Electrolytic iron
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Ferric ammonium citrate
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Ferric caseinate
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Ferric citrate
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Ferric gluconate
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Ferric phosphate
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Ferric pyrophosphate
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Ferrous carbonate, stabilized
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Ferrous citrate
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Ferrous fumarate
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Ferrous gluconate
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Ferrous lactat
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Ferrous succinate
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Ferrous sulphate
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Hydrogen reduced iron
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Sodium ferric pyrophosphate
Reference
Ministry of Health Malaysia. (2017). Food Regulations 1985. Twelfth Schedule.