It contains bacteriostatic benzyl alcohol, which means you can re-use the same vial the second time without worrying about bacteria

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Here are some of the most common reasons for vitamin B12 deficiency: Pernicious Anemia This is the most common cause of vitamin B12 deficiency worldwide and mainly affects people of Northern European ancestry
Some people experience slight soreness at the site, which usually fades quickly
Make sure to speak with your doctor to find the best option for you
Iron deficiency is the most common deficiency in the U.S., affecting about 10 percent of women of childbearing age and 1 percent of men under age 50 in developed countries