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You may have a deficiency if you are vegan, dont eat enough B12 rich food, or if you have other health conditions which mean you are unable to absorb it properly, such as pernicious anaemia
Short-term refrigeration at 2-8C is acceptable for up to 4 weeks
Promoter polymorphisms in glutathione-S-transferase genes affect transcription [PMID: 15128050] Laboratory literature summary: Promoter polymorphisms in glutathione-S-transferase genes affect transcription
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