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I Feel Tired All the Time. Do I Need a B12 Shot?: Shawn Veiseh, M.D.: Family Medicine Why do I feel worse after a B12 injection? CoLaz Vitamin B12 can be transformative for some people scroll through to read one ladies response. I see results like this all the time with B12 in clinic. Why get an injection Common & Rare Side Effects of Vitamin B12 Injections Photo by Westbury Chemist (@westburychemist) April 3, 2026
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