In the ever-evolving world of beauty trends, few have sparked as much debate – and discomfort – as "menstrual masking". This is the practice of applying menstrual blood to the skin, usually the face, as a form of DIY skincare.

Popularised on social media , hashtags such as #periodfacemask have amassed billions of views. In most videos, users apply menstrual blood for a few minutes before rinsing it off. There's no clear agreement on how much blood to use or how long to leave it on.

Some call the practice healing or empowering, describing it as a spiritual ritual that connects them to their bodies and ancestral femininity. But what does the science say?

Advocates of menstrual masking often argue that period blood contains stem cells, cytokines, and proteins that could rejuvenate th

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