Anything related or nowadays even remotely related to anything medical in nature, is flagged by FB Ads algorithms. It may be herbal, it may be no surgery, no laser, no injection or no whatever, it does not matter to FB Ads algorithms. What people do to run such niches, is a cloaked campaign, which has already been fully discussed in several threads in the https://www.blackhatworld.com/forums/facebook.219/ section (and hundreds of threads in the https://www.blackhatworld.com/forums/google-ads.83/ section). So, by searching in the https://www.blackhatworld.com/forums/facebook.219/ section & https://www.blackhatworld.com/forums/google-ads.83/ section, you will get a very clear picture about what is a cloaked campaign and how it is done. After that incase you require even further help with reference to your particluar campaign, to be cloaked, then it is never a "one size fits all", you may consider to https://www.blackhatworld.com/forums/hire-a-freelancer.76/, because there are lots of exact specifics that go into the mix, such as landing page(s) (safe page, money page), content of these 2 types of landing pages, if it is a display ad (like in your case), then the creative(s), etc, etc, etc.