I say BS. I had lines on my nails for yrs.
Unless they are types of lines that dont correspond to other multiple potential problems that can cause lines in your nails, it would be dificult to conclusively say it was due to covid.
vertical lines are normal, especially as one ages.
This refers to horizontal ridges - going across the nail like speedbumps, as opposed to going down a nail
I was told years ago they were arthritis lines.
Same as mine. This clowns are reaching for invisible straws to keep us scared.
What’s next? You have eye bags, meaning you just had COVID! Where did they get this stupid study? From the Bud Light Institute?