It's a legit journal. Steps you can take to look:

1. Go to the journal's own website and look for their "About us" link. Read what they have to say. Legit journals all sort of have the same mission.
2. They're supported by Wolters-Kluwer. You can dig on them. These guys are an institution in medical education. They publish the well known Goodman & Gilman's text any nursing, pharmacy, or medical student will read. They also publish and maintain the Lexicomp drug database, which is IMHO the best of the ones out there.
3. Look up their impact factor. Higher = better and indicates that they're publishing good work that other people also cite in their papers. The New England Journal of Medicine is always at the top of the list. This one sits at ~1.9 this year which is respectable, but not one of the top 10. They're also trending up year over year.

Also, you should check the authors, especially the lead author (who presumably did the most work) and the last author (who is typically the guy who runs the lab and coordinated the project).

1. Search their name in the search engine of your choice
2. Look at their CV and credentials
3. Are they a practicing physician? An academic physician/professor? Or are they something else?
4. Are they politically active or otherwise controversial? Have they had papers withdrawn or retracted in the past?

This one's lead author is politically active with the FLCCC which has become a major target for all of the usual suspects we've learned to "trust" at CDC, FDA, the Biden "administration", Big Pharma, and their allies in the media. The "fact-checkers"/political commissars have had this guy in their crosshairs, so he's stirred up quite the hornet's nest.