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There are many ways in which both losing weight and using weight loss jabs can lead to changes in your menstrual cycle

Multiple shots : If you have a significant deficiency, your healthcare provider might recommend a series of shots over several weeks

Independent groups have observed consistent patterns across the published research record, providing cross-laboratory replication for the core mechanism findings documented in the foundational papers cited above

Olasupo Odunsi, MD, Medical Director Reviewed July 5, 2026 If you're constantly tired and your metabolism feels stuck, low B12 could be part of the problem

If diarrhoea is accompanied by fever, blood in stools, severe abdominal pain, or dehydration, an infectious or inflammatory cause should be considered and medical attention sought promptly

Soreness duration decreases