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can b12 injections raise blood pressure Vitamin Injections: What You Need To Know Why Do I Feel Worse
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However, this does little good in a person with absorption issues

This list is not exhaustive

Showgem, "I do wish b12 vials were available in differing doses as maybe more often but less would work better

Proper dose escalation to minimize side effects Nausea and fatigue, the symptoms often attributed to b12 needs, more commonly result from starting doses too high or escalating too quickly
