injection b12 dosage Vitamin B12 3000 mcg Vitamin B12 Monthly Injection: Typical

10.1182/blood-2016-10-569186 24 GreenR.AllenL

During winter months, when natural light exposure decreases, many people experience disruptions in serotonin production that contribute to SAD symptoms

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It is also necessary for the proper functioning of the immune system

Vitamin B12 deficiency If left untreated, vitamin B deficiency can harm your brain and nervous system, leading to issues such as: Incontinence (not being able to control your pee or poop) Nerve issues, such as numbness, weakness, or nerve pain Erectile dysfunction (not being able to get an erect penis) Paralysis (not being able to move your body) Memory loss Paranoia (feeling like others are trying to hurt you) If you dont have symptoms but are at risk of low B12 levels, your doctor might also want you to have regular tests