do vitamin b12 injections affect menstrual cycle From Sunshine to Wellness: Understanding D Impact on Health - Muthukumaran - 2025 - Advances in Public Health Vitamin B12 Injection: Benefits, Uses

This inconsistency sometimes leads people to think the medication has stopped working when the issue is actually variable absorption from inconsistent technique

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Pregnancy can dramatically worsen a pre-existing B12 deficiency, because B12 is transferred to the growing foetus throughout pregnancy, and prenatal vitamins contain only six micrograms of this nutrient (compared to the 1,000 micrograms needed to treat deficiency)

10.1172/JCI106569 [DOI] [PMC free article] [PubMed] [Google Scholar] 19

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300 mcg daily