can b12 injections bring on periods cause period in menopause Vitamin B Complex Injection – Support During perimenopause and menopause, hormonal changes impact energy, mood, sleep, and overall wellbeing. A Vitamin B Complex injection may Heavy Periods Vitamin B12 |

Instead of a quick spike followed by an inevitable crash, the goal is to replenish what you may genuinely be short on, so your energy feels steadier and more even rather than jittery

A vitamin B12 deficiency can lead to megaloblastic anemia, a condition characterized by a low number of red blood cells that are larger than normal ( Megaloblastic anemia can cause a variety of symptoms and side effects, including ( shortness of breath headache heart palpitations fatigue poor balance memory loss That said, being low in vitamin B12 doesnt always lead to megaloblastic anemia, and many people may only experience mild symptoms like fatigue ( Furthermore, while a deficiency in vitamin B12 may not cause weight gain, it can decrease energy levels and contribute to fatigue, making it harder to stay active and manage your weight

This vitamin is found in a variety of foods including liver, kidneys, yeast, and leafy, green vegetables

To learn about staying safe, you can check out more about B12 shot safety

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Civil Engineering, UCLA Last updated: July 2026 Human-researched and AI-assisted with full editorial review