There are 0 calories in 10 ml of Feroglobin Plus Gentle Liquid Iron by Vitabiotics from: Carbs 0g, Fat 0g, Protein 0g. Get full nutrition facts for your favorite foods and brands.
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It doesn't appear to have any carbs so I can't imaginw why it wouldn't be OK. Having said that, I don't know what other meds you are taking or what type of diabetes you have. But hopefully the person who asked you to take it knows your medical history???