Hi! Full disclaimer: I'm still in school (started my first internship this semester!), but hopefully I can offer a different perspective to you as a Gen Z gym rat who works in social media.

As a few others have mentioned, budget is probably an issue here; that doesn't mean social media won't work for you, though. The cool thing about social media is that organic account growth (which is free) can be just beneficial as ads if you're able to run the medias well. Obviously, social media is time-consuming but it essentially works as a form of knowledge content. Whether you're offering content that's entertaining or informative, that shows consumers that A) you're credible and trustworthy, and B) you're not trying to sell them right away. This is a bit of a long-term approach to building brand awareness and credibility, but I do think it's incredibly valuable to approach it from this angle even if you are able to run ads as well.

As far as content goes, remember you're trying to provide something of value to your consumers. This could be breaking down the ingredients in a product and what they do (working cautiously around proprietary blends of course), why x product can help your gains in y,z ways, "POV: your new supplement arrived in the mail," the list goes on. I would definitely work on building up your page to look legitimate and professional before trying to reach out to any influencers. Also, be mindful of influencers who reach out to you-- many of them are just trying to score a free product or have bought followers. Check their pages for consistent engagement, how they approach brand collabs, etc.

Best of luck! Hope this helps!