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If your blood levels are lower than 200pg/mL or if you are diagnosed with pernicious anemia, your doctor may recommend B12 supplementation via injection

Vukmirovic-Popovic et al

Vitamin B12 deficiency Vitamin B12 is an essential water-soluble nutrient also known as cobalamin

The detailed uses of Key B12 PFS 1500 mcg Injection 1 ml are as follows: Treat vitamin B12 deficiency: Key B12 PFS 1500 mcg Injection 1 ml helps correct vitamin B12 deficiency, particularly in individuals with dietary insufficiency, malabsorption conditions (like pernicious anaemia or post-gastrointestinal surgery), or chronic illnesses

Most people feel a lift after a B12 shot, but a minority feel briefly worse