---
title: "STUDIES: Menstrual Abnormalities Strongly Associated with Proximity to COVID-19 …"
source: "https://x.com/NicHulscher/status/2038999793460990429"
platform: "X / Twitter"
factual_accuracy: 5
overall_accuracy: null
tags: ["covid-19 vaccine", "vaccine safety", "menstrual abnormalities", "exosomes", "mrna persistence", "vaccine shedding"]
---

# Source fact-check: STUDIES: Menstrual Abnormalities Strongly Associated with Proximity to COVID-19 …

Original post: https://x.com/NicHulscher/status/2038999793460990429
Factual accuracy: 5% · Overall accuracy: Unknown

## Source post

**Target post by @NicHulscher**

> STUDIES:
>
> Menstrual Abnormalities Strongly Associated with Proximity to COVID-19 Vaccinated Individuals: https://t.co/tdoNg1YXPz
>
> Pfizer mRNA Found in Man's Exosomes 3.5 Years Later: https://t.co/Bzb7HRaSuI https://t.co/kf2RUfnNey

## Post analysis

Post analysis will start after all claims are evaluated.

## Claims found (2)

<a id="D7C1DO7pzP5tYZ9aHhgr"></a>
### 1. Menstrual abnormalities are strongly associated with proximity to individuals vaccinated against COVID-19 — 0%

Model: Kimi K2.5 · Checked on: 07/04/2026 · Detail: /claim/D7C1DO7pzP5tYZ9aHhgr

Based on my research, this claim refers to the debunked theory of "vaccine shedding" affecting unvaccinated individuals. Here is my fact-check analysis:

##### Reasoning:

- **COVID-19 vaccines cannot "shed"** - The claim relies on the false premise that vaccinated individuals can shed vaccine components to nearby people. Nebraska Medicine and medical experts confirm it is **biologically impossible** for COVID-19 vaccines to shed because they do not contain a live virus[^3][^1]. mRNA and adenovirus vector vaccines cannot replicate or spread from person to person.

- **The "study" cited is from a controversial anti-vaccine journal** - A study claiming unvaccinated women within 6 feet of vaccinated people experienced menstrual changes was published in a journal **not indexed in the National Library of Medicine** that primarily publishes unsubstantiated anti-vaccine content[^3].

- **Authors have credibility issues** - Several study authors are affiliated with prominent anti-vaccine organizations, and one authored a **now-retracted study** falsely linking the MMR vaccine to autism[^3].

- **No established biological mechanism exists** - Medical experts state there is no biological mechanism by which proximity to a vaccinated person could affect menstruation[^1].

- **Real research shows temporary changes in VACCINATED women only** - Legitimate studies confirm some vaccinated women may experience temporary menstrual cycle changes (typically one day longer) due to the immune response to vaccination itself—not from proximity to others[^5][^4][^2]. These changes are short-term and not caused by "shedding."

- **Coincidence vs. causation** - Experts note that with millions of women receiving vaccines, some will naturally experience atypical cycles that coincidentally occur around the same time as vaccination or being near vaccinated people[^1].

**Overall validity: 0%**

[^3]:
    [Dubious study connects so-called COVID-19 vaccine “shedding ...](https://publichealthcollaborative.org/alerts/dubious-study-connects-so-called-covid-19-vaccine-shedding-with-menstrual-abnormalities-sparking-discussion/)

[^1]:
    [COVID-19 vaccines, irregular periods and spike protein shedding](https://www.nebraskamed.com/COVID/the-covid-19-vaccines-irregular-periods-and-spike-protein-shedding)

[^5]:
    [Validating community concerns of menstrual changes associated ...](https://www.sciencedirect.com/science/article/pii/S0264410X25008084)

[^4]:
    [Menstrual Changes Following COVID-19 Vaccination - PMC - NIH](https://pmc.ncbi.nlm.nih.gov/articles/PMC10890281/)

[^2]:
    [Menstrual disorders following COVID-19 vaccination: a review using ...](https://www.frontiersin.org/journals/drug-safety-and-regulation/articles/10.3389/fdsfr.2024.1338466/full)

<a id="qBVcMQJKmABzb5SJyvEU"></a>
### 2. Pfizer messenger RNA was found in a man's exosomes 3.5 years after vaccination — 10%

Model: Kimi K2.5 · Checked on: 07/04/2026 · Detail: /claim/qBVcMQJKmABzb5SJyvEU

Based on my research, here is my analysis of the claim:

**Analysis:**

- The claim references a preprint study titled "Persistence of Vaccine mRNA, Plasmid DNA, Spike Protein, and Genomic Dysregulation Over 3.5 Years Post-COVID-19 mRNA Vaccination" published on Zenodo (February 2026), NOT a peer-reviewed scientific paper[^4]. The study reports detection of Pfizer vaccine mRNA in circulating exosomes at 1,284 days (approximately 3.5 years) post-vaccination in a single individual[^4].

- This is a **single case study** with significant methodological limitations—no control group, no peer review, and no independent validation of the findings. The study was conducted by authors including Nicolas Hulscher and Peter McCullough, who have documented histories of promoting vaccine misinformation and whose previous claims have been repeatedly debunked by fact-checkers[^5][^3][^8][^6]. The McCullough Foundation has been criticized for flawed research methodology and misrepresenting scientific data[^3][^5].

- The scientific consensus from peer-reviewed research contradicts this extraordinary claim. Published studies in reputable journals show that while modified mRNA may persist longer than initially assumed (days to weeks), detection typically occurs within much shorter timeframes: vaccine mRNA was detected in blood up to 15 days post-vaccination[^1], and in lymph nodes up to 60 days[^1]. A Nature-published study found vaccine mRNA routinely persists up to 30 days from vaccination[^1].

- The CDC's official guidance and peer-reviewed literature acknowledge that mRNA vaccine components are generally cleared rapidly, though some spike protein may persist for weeks. The extraordinary claim of 3.5-year persistence in exosomes is not replicated in any peer-reviewed, validated scientific study[^9][^7][^1].

- The preprint's conclusion states this "documents the longest reported in vivo persistence of vaccine-derived mRNA," which implicitly acknowledges this is an outlier claim not supported by the broader scientific literature[^4]. Detection in a single case using methods that have not undergone peer review does not constitute reliable scientific evidence.

- The claim database contains no verified claims supporting mRNA persistence for 3.5 years. Major health authorities including the FDA and CDC continue to maintain that mRNA vaccines are safe, with components clearing within days to weeks, though ongoing research examines potential longer-term effects[^2][^9].

**Overall validity: 10%**

This claim is based on an unreviewed preprint from authors with credibility issues regarding vaccine claims, not established peer-reviewed science. While it documents a single case report, it lacks the rigorous validation, replication, and peer review required to substantiate such an extraordinary finding. The claim contradicts the broader scientific consensus on mRNA vaccine pharmacokinetics.

[^4]:
    [Persistence of Vaccine mRNA, Plasmid DNA, Spike Protein, and ...](https://zenodo.org/records/18460099)

[^5]:
    [COVID-19 vaccines not shown to have “negative efficacy”, contrary ...](https://science.feedback.org/review/covid19-vaccines-not-shown-negative-efficacy-contrary-claim-nicolas-hulscher/)

[^3]:
    [Anti-Vaccine Mad Libs: The McCullough Foundation's “Landmark ...](https://theunbiasedscipod.substack.com/p/anti-vaccine-mad-libs-the-mccullough)

[^8]:
    [Person: Peter McCullough](https://www.factcheck.org/person/peter-mccullough/)

[^6]:
    [Did a South Korean study really claim that COVID-19 vaccines ...](https://www.aljazeera.com/features/2025/10/11/did-a-south-korean-study-really-claim-that-covid-19-vaccines-cause-cancer)

[^1]:
    [Duration of SARS-CoV-2 mRNA vaccine persistence and factors ...](https://www.nature.com/articles/s41541-023-00742-7)

[^9]:
    [Debunking mRNA Vaccine Misconceptions—An Overview for ... - PMC](https://pmc.ncbi.nlm.nih.gov/articles/PMC7956899/)

[^7]:
    [Research Advances on the Stability of mRNA Vaccines - PMC](https://pmc.ncbi.nlm.nih.gov/articles/PMC10051489/)

[^2]:
    [\[PDF\] Workgroup Safety Uncertainties of mRNA COVID Vaccines - CDC](https://www.cdc.gov/acip/downloads/slides-2025-09-18-19/06-el-deiry-kuperwasser-covid-508.pdf)