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How Taking B12 Can Make Menstruation More Comfortable Vitamin B12, also known as cobalamin, is an important nutrient that can be found in foods like eggs, meat, and fortified cereals and dairy products

It summarises areas of ongoing research and does not constitute medical advice, product claims, or recommendations for human use.

Not to mention its safety

What the science actually says Here is where the marketing and the evidence part ways: Metabolism

While some users report enhanced local effects, the evidence for superiority over subcutaneous administration remains unclear, and complications including nerve irritation present greater concern