what do vitamin b12 injections do You Need a Prescription for Injections? Feeling worse after B12 Injection:

If you and your doctor decide to try vitamin B 12 pills, in whatever form, it will be important to have regular blood tests to be sure you're getting enough of the vitamin

But because unexplained hypercobalaminemia has been consistently associated with an elevated risk of subsequent cancer diagnosis in large population studies, its one of those lab results worth following up on rather than hoping it goes away

Adequate vitamin B12 levels support healthy nerve function and DNA synthesis, both of which are important for the development and activity of white blood cells

No, you cant

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