The analysis of the clinical trial was published in a very reputable and peer reviewed scientific journal [1,2].
> How can I know if this is actually safe?
In the reports [1,2].
If you believe that data is fake then I am afraid you just not want to be convinced.
[1] https://www.nature.com/articles/s41586-020-2622-0 [2] https://pubmed.ncbi.nlm.nih.gov/32991794/