Is "Shedding" Causing Menstrual Irregularities? - MCS Group


Out of the 6,049 women surveyed, the study focused on 3,390 unvaccinated women without prior COVID-19. The results showed that 85.5% of these women had been in close proximity to someone who had been vaccinated. Within a week of contact, 71.7% experienced irregular periods, and within three days, 50.1% had irregular periods. The study also revealed that daily proximity to vaccinated individuals increased the risk of heavier bleeding and changes in menstrual timing, suggesting a potential link between vaccine substances and menstrual changes in unvaccinated women.

Further Analysis

The study highlighted the administration of mRNA vaccines for COVID-19 starting in December 2020 and the lack of thorough pre and post clinical studies on these gene therapies. It also revealed a data gap in reporting menstrual irregularities as specific symptoms during vaccine trials and surveillance systems.

The Link Between Vaccination and Menstrual Irregularities

Despite the initial oversight, women continued to report menstrual issues after receiving COVID-19 vaccines. Multiple retrospective and prospective clinical studies have since supported the connection between vaccination and menstrual irregularities. To better understand this phenomenon, the MyCycleStory℠ (MCS) research collaborative conducted an online survey including both vaccinated and unvaccinated participants, with a focus on the cohort of unvaccinated individuals who had no prior exposure to the spike protein.

The Need for Further Investigation

The study underscores the importance of thoroughly investigating the excretion and transmission of COVID-19 vaccine components, as they appear to affect unvaccinated individuals. It emphasizes the need to study the impact of these substances on menstrual health and advocates for more research to identify the causes and potential treatment solutions for the observed menstrual abnormalities.

In summary, this study sheds light on the experiences of women who noticed changes in their menstrual cycles after being in proximity to vaccinated individuals. It highlights the necessity of further investigating the effects of vaccine components on menstrual health and stresses the importance of amplifying the voices of affected women, whose experiences were initially suppressed.


  • Sue E. Peters PhD: Senior Researcher, Children’s Health Defense, Franklin Lakes, NJ 
  • Jill Newman MS: Independent Researcher, Mount Pleasant, SC 
  • Heather Ray: Science and Research Assistant, Children’s Health Defense, Franklin Lakes, NJ 
  • Tiffany Parotto: Director and Founder of MyCycleStory, Research Analyst
  • Brian Hooker PhD: Chief Scientific Officer, Children’s Health Defense, Franklin Lakes, NJ 
  • Dan McDyer MD: Private Practice Obstetrician/Gynecologist, Jacksonville, FL 
  • Leonard Murphy: Research Advisor, Atlanta, GA 
  • Raphael B. Stricker MD:Union Square Medical Associates, San Francisco, CA 
  • Maureen McDonnell BSN: Barnardsville, NC
  • Paul J. Mills PhD: Professor, Family Medicine and Public Health, University of California, San Diego, La Jolla, CA
  • Warren Geick: Research Data Analyst, Austin, TX 
  • Christiane Northrup MD: Former Fellow of the American College of Obstetrics and Gynecology, Former Assistant Clinical Professor of Ob/Gyn U of Vermont College of Medicine, Portland, ME

Study Snapshot

The study’s findings call for a comprehensive investigation into the excretion and transmission of vaccine components, shedding light on potential impacts on menstrual health.

Simple Summary of the report: This study looked at how being close to people who got the COVID-19 vaccine could affect women’s periods. They found that women who were near vaccinated people had more problems with their periods, like heavier bleeding or changes in the timing of their periods.

Why this study was performed: The researchers wanted to understand if being around vaccinated people could cause menstrual problems in women who didn’t get the vaccine. They were also curious about the substances from the vaccine that might be passed from vaccinated to unvaccinated people.

What’s important to note: Most women who had symptoms were close to vaccinated people, but some were not directly exposed to the COVID-19 spike protein. The vaccine components and products can stay in the blood for a few months after vaccination. Women who had previous exposure to the spike protein had different symptom patterns compared to those without exposure.

Noteworthy numbers and what they mean: Around 86% of women reported being close to vaccinated individuals. Many women experienced symptoms within one week of being near a vaccinated person. Women who were daily exposed to vaccinated people outside their household had a higher risk of menstrual problems.

Considerations worth investigating: The study didn’t prove that the vaccine caused the menstrual problems, but there might be a link. The substances from the vaccine that could be transmitted are the spike protein, lipid nanoparticles, and exosomes. It’s uncertain which of these substances might be causing the menstrual irregularities.

Simple Conclusion: The study found that women who were near vaccinated people had more menstrual problems. More research is needed to understand how the vaccine components or products might be transmitted and what exactly causes these problems. For now, it’s important to keep studying and being careful.


  • COVID-19 vaccine: A shot that helps protect against the COVID-19 disease caused by the coronavirus.
  • Menstrual problems: Issues with women’s periods, like heavier bleeding or changes in the timing of their periods.
  • Spike protein: A part of the coronavirus that the vaccine teaches the body to recognize and fight.
  • Vaccine components: The different parts of the vaccine, like the spike protein or lipid nanoparticles.
  • Transmitted: Passed from one person to another.
  • Lipid nanoparticles: Tiny particles that protect and deliver the vaccine’s mRNA.
  • Exosomes: Small structures that carry different substances in the body.
  • Menstrual irregularities: Changes in the normal pattern of a woman’s menstrual cycle.



The study reveals a data gap in vaccine trials, where menstrual irregularities were not included as pre-specified symptoms, raising questions about the comprehensive assessment of vaccine safety.




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