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More specialised tests such as active B12 (holotranscobalamin) or methylmalonic acid may be available through specialist referral, though availability varies across the UK
Vitamin B12 is a water-soluble vitamin needed for healthy red blood cell formation and DNA production
For comprehensive storage guidance covering all peptide types, read how to store peptides
Yue, T., Fang, Q., Yin, J., Li, D
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