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Two common evidence-based patterns: How fast will I feel better

Symptoms associated with vitamin B12 may mask signs of polycythemia vera

Lahner E, Persechino S, Annibale B

Selecting Vitamin B12 Supplements How to Compare Various Vitamin B12 Supplements When choosing a vitamin B12 supplement, there are several criteria to consider: Dosage: the correct dosage for the purpose of use (see above) Active ingredient: prioritise natural forms (see above) Additives: pills especially have many unnecessary, potentially dangerous additives, whereas capsules are purer Trusted sources: sometimes cheap imitation supplements are on sale here quality active substances and purity cannot be guaranteed

The recommended dose for pregnant women is 2.6mcg per day and 2.8mcg per day for breastfeeding mothers