However, excessive administration may increase the risk of side effects such as headache, dizziness, nausea, or injection site reactions
It is also vital to the normal function of the nervous and immune system
Speed of results: Injections work faster
Since B12 is responsible for critical functions like energy production, DNA synthesis, and nerve protection, low levels can significantly affect your day-to-day wellness
Some clinics insist on a blood test first
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