Many gain experience while working in the industry. A great way to dip your toe into the regulatory field is to attend webinars, conferences, etc. that are interesting to you. I follow some great influencers ( is this what they are now?) on LinkedIn and they share commentary on things like cosmetic regulation, marketing claims, warning letters, and how to be great at spotting regulatory issues and general non-compliance.
Also, there are different fields in regulatory- cosmetics, medical devices, CBD /marijuana is a new & fast growing one now, etc. etc. So there’s lots to learn. 😇 have fun