- Cyanocobalamin (R = –CN)
- Hydroxocobalamin (R = –OH)
- Methylcobalamin (R = –CH3), an active form of vitamin B12
- Adenosylcobalamin (R = –Ado), also an active form of vitamin B12
Cobalamin is susceptible to acid. During its biosynthesis, complexes are formed that protect it.
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