Are the claims about improving gut health or boosting immune response backed up by any hard science? (Not trying to be a jerk, I really don’t know)
If not, then that could be the grounds on which FB felt it violated that policy. If it can’t be scientifically demonstrated that the product actually does those things, then Facebook likely considers it a misleading claim.
I found [multiple](https://www.scientificamerican.com/article/do-probiotics-really-work/) credible sources [against probiotic](https://www.webmd.com/digestive-disorders/news/20180906/probiotics-dont-believe-the-hype#1) claims and [in favor of them](https://www.health.harvard.edu/vitamins-and-supplements/health-benefits-of-taking-probiotics). Even that Harvard Health Publishing link in favor had a disclaimer at the bottom about probiotic drugs (which it’s in favor of) vs. probiotic supplements (which it warns are unregulated and not guaranteed to actually do anything).
Seems like the product you’re marketing is controversial and the science hasn’t quite landed on whether it’s legit or not, but is currently leaning towards “probably not.” Supplements in general are an industry that has taken a lot of heat and gotten a lot of negative attention in recent years. I’m not sure you will get it reinstated, at least not without scrubbing any claims that aren’t backed up by current scientific research.
I also found a few articles that suggest that Facebook started cracking down on supplements’ health claims around this time last year:
* [https://fortune.com/2019/07/02/facebook-sensational-health-claims-misinformation/](https://fortune.com/2019/07/02/facebook-sensational-health-claims-misinformation/)
* [https://www.revelist.com/wellness/instagram-facebook-diet-tea-ban/16434/bodypositivity-activist-jameela-jamil-applauded-the-efforts-to-clamp-down-on-such-marketing/4](https://www.revelist.com/wellness/instagram-facebook-diet-tea-ban/16434/bodypositivity-activist-jameela-jamil-applauded-the-efforts-to-clamp-down-on-such-marketing/4)
* [https://time.com/5619736/facebook-health-claims-news-feed/](https://time.com/5619736/facebook-health-claims-news-feed/)
* [https://www.advertisemint.com/13-types-businesses-cant-advertise-facebook/](https://www.advertisemint.com/13-types-businesses-cant-advertise-facebook/)
>2. Businesses That Sell Unsafe Supplements
>
>If Facebook determines that a supplement a business is selling is unsafe, it will consider any related ads to be in violation of its policies. Businesses with this type of product can’t advertise on Facebook.
​
So, based on everything that I found just by doing a few minutes of Googling suggests that the outlook isn’t good on you getting those ads reinstated.
***Edit***: *Found something that might be helpful for you below.*
This article titled “[How to Buy Facebook Ads as a Supplement Company Without Getting Banned](http://www.triedandtruemedia.com/how-to-buy-facebook-ads-as-a-supplement-company-without-getting-banned/)” starts out describing exactly what you experienced.
>You’re running your ad campaigns, and you finally get them approved by Facebook Ads. Then, after a day or two of them running, they shut down for seemingly no reason when they’d previously been approved.
>
>We’ve all been there. Especially those of us who work with sensitive ads like supplements.
You might find the suggestions there to be helpful.
This one seems helpful as well. [https://autolikes.com/blog/2019/09/how-facebook-supplement-business](https://autolikes.com/blog/2019/09/how-facebook-supplement-business)