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If very large volumes were mistakenly injected, theoretical effects could include CNS depression, low blood pressure or breathing changes, but such overdoses are not reported at normal doses

According to a study published in PubMed Central (National Institutes of Health), intravenous administration of vitamin B12 provides a faster increase in B12 levels compared to oral supplementation, making it a potentially better option for patients with severe deficiency

While B12 is typically found in animal-based foods such as meat, fish, eggs and dairy, some people may have trouble absorbing it - especially due to certain health conditions, medications or dietary choices like veganism

As with any supplement, its important to talk with a healthcare professional to determine whether a vitamin B12 supplement is necessary for you