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In the body, arginine is the largest source of nitrogen used for production of nitric oxide, which relaxes blood vessels, improving blood flow throughout the body

Keep in mind that B12 injections reliably help people who are genuinely deficient, so the first step is confirming your levels with a provider

While foods like grass-fed beef, dairy products and fish supply a good dose of vitamin B12, some people abstain from eating these foods or have a harder time absorbing and utilizing this nutrient due to digestive/metabolic limitations

The time it takes to feel results from a B-12 injection can vary depending on the individual and the severity of the deficiency

I felt like I was coming down with something yesterday, but today just really tired and foggy headed

[DOI] [PubMed] [Google Scholar] 5.Kuzminski AM, Del Giacco EJ, Allen RH, Stabler SP, Lindenbaum J