how to give a b12 injection under the skin What happens if you inject wrong? Ivy Grove Surgery : Self-administration
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Decreased sperm count and infertility caused by reduced testicular function

There is a chance that a small number of people may also experience more serious side effects that include allergic reactions and heart issues
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The Initial Boost: What to Expect After Your First Shot If youve been diagnosed with a significant B12 deficiency, your GP will likely prescribe an initial course of injections, often called a loading dose phase

Adults need around 2.4 micrograms (mcg) of vitamin B12 a day, and women who are pregnant or breastfeeding need more

PMID 17474166
