18 Table 4 Time to Improvement of Abnormalities in Vitamin B12 Deficiency After Initiation of Treatment A 2005 Cochrane review involving 108 patients with vitamin B 12 deficiency found that high-dose oral replacement (1 mg to 2 mg per day) was as effective as parenteral administration for correcting anemia and neurologic symptoms
How Long Does a Vitamin B Drip & Injection Take B12 or B complex shot: About 5 minutes in total
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So, if you are eating a varied diet and do not have a laboratory-documented vitamin B12 deficiency, you do not need additional supplementation. However, she explains people who subscribe to strict vegan or vegetarian diets are much more likely to be at risk of vitamin B12 deficiency, and they should take supplemental B12, especially when pregnant or trying to become pregnant
One very elegant design is to use a form of B12 that can be detected by rather sophisticated methodologies in a blood sample
Post-injection care : Gently massage the site afterward to help disperse the vitamin and reduce localized soreness