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If the deficiency is due to an underlying condition, they may require ongoing shots
Sanz-Cuesta et al., 2020
User reports consistently mention mild headaches, particularly during the first week or two of use
It started after injection number 4 and when I mentioned it to the nurse administering the injections she was dismissive and didnt appear to know (or believe) it was a possible side-effect
32 Similarly, an association between elevated homocysteine levels and cognitive impairment has been noted, but subsequent vitamin B 12 replacement does not have preventive or therapeutic benefit
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