Studies and Research
The body of research on the effects of intramuscular injections is vast and detailed. However, the highly technical language in these studies can be difficult for the general public to understand.
In public health research, authors often soften their wording due to pressure from journals to downplay negative findings on side effects and adverse reactions. As a result, important insights are frequently obscured or carefully phrased in the papers themselves—though they remain visible in the data sets and discussion sections upon close review.
To address this, HFDF has created this searchable compendium of studies, each paired with clear, plain-language summaries and notes prepared by our team. Our goal is to cut through technical complexity, bias, and ambiguity so individuals can access the key facts and make informed health decisions.
This resource will continue to grow, with new studies and improvements added regularly.
Please note that HFDF does not necessarily endorse or support any policy arguments or specific assumptions made by the authors. HFDF commentary describes and summarizes the role this study plays in the scientific discourse and provides abbreviated notes.
Recently Posted Studies
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Influenza vaccine effectiveness in Italy: Age, subtype-specific and vaccine type estimates 2014/15 season
This study examines a year in Italy’s vaccination campaign against influenza A. It finds one strain was particularly poorly matched.
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Psychiatric adverse events following COVID-19 vaccination: a population-based cohort study in Seoul, South Korea
This study shows broad based psychiatric disorders after mRNA vaccination in South Korea, and some decrease in other disorders.
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Long-term risk of autoimmune diseases after mRNA-based SARS-CoV-2 vaccination in a Korean, nationwide, population-base cohort study
This study outlines how public data in South Korea shows that mRNA-based vaccination increases lupus diagnosis
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Intracellular reverse transcription of Pfizer human liver cell line
Journal: Current Inssues in Molecular BiologyLead Author:
Alden, et al.Original date of publication:
02/01/2022This study shows how the Pfizer mRNA vaccine has the apparent capacity to integrate into the genome of human cells.
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COVID-19 vaccination BNT162b2 temporarily impairs semen concentration and total motile count among semen donors
Journal: AndrologyLead Author:
Gat, et al.Original date of publication:
06/01/2022Keywords: adverse events, andrology, clinical trials, covid vaccination, fertility, Moderna, mRNA, Pfizer, semen countThis study revealed the damage to men’s motile sperm count after the Pfizer 2-shot series among sperm donors.








