WASHINGTON — Federal health officials are citing an extensive list of studies purported to document harms caused by messenger RNA vaccines as scientific justification for canceling hundreds of millions of dollars in investment in the technology .

Health secretary Robert F. Kennedy Jr. provided only a brief explanation for the decision earlier this week, arguing the mRNA vaccines are not effective and not as safe as alternatives, and referencing a review of scientific research on mRNA by “experts,” without identifying them. On Friday, when asked if the Department of Health and Human Services had a scientific justification, a spokesperson provided a link to a 181-page list of studies compiled by a number of people, including a current Trump administration adviser who served in the preside

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