She provides sources for all her podcasts and basically just reads from scientific journals the entire time. I would separate her content from your typical "Dr." She's also not a medical doctor fyi, just a researcher.
Like I can find people promoting magnetic bracelets to align my Chi and they will be citing supposedly scientific articles which supposedly back up their claims. In extreme cases like that I can feel pretty confident that it's bullshit. But the relative health benefits of eating berry A or berry B? It seems intractable. I'm left with trusting my instincts and common sense.
Personally find it extremely easy to detect scams. You also don't need a degree or much more than a HS degree to check sources, this was taught to most of us in high school.
You're right though, there's a billions and billions of dollars in marketing and misinformation aimed at the people who skipped that class in school (especially in the health space).
[0]: https://www.foundmyfitness.com/genetics
--- It was actually this report that highlighted that I might have a high likelihood for a weird genetic issue that causes you to have extremely low vitamin D. This caused me to go get testing for this as I would get bad seasonal depression in the winters. At the age of 27 my doctor told me that it was the lowest levels of Vitamin D she's ever seen including her elderly patients. This isn't something any of common mainstream genetic reports provide and they charge 10X more. You would need to generate a report manually through one of the databases to find those studies or manually look up individuals SNPs
If by "check a source" you mean look it up and read it, sure. But that tells you relatively little; you can verify that a claim appears in that source but actually weighing the validity of that source requires a lot more specialized expertise.
That you think a highschool course can teach all you need to reliably detect bullshit makes me think you're a lot more credulous than you seem to think.
The rest of your post is more or less about the heuristics you use in lieu of being a subject matter expert. And those heuristics are known to influencers and are routinely gamed. For instance, you're impressed that this influencer criticizes supplement companies. People peddling bullshit routinely trash talk their own or adjacent fields in order to gain trust, this is a textbook tactic. Used car salesmen trash talk used car salesmen, to make themselves seem candid and honest. Textbooks about sales and persuasion teach this tactic. Supplement peddlers trash talk homeopathy, homeopaths trash talk chiropractors, etc. Of course people who aren't peddling bullshit will trash talk bullshit too, everybody else does too so it's a very unreliable heuristic.
For every medical claim someone makes, you can find at least 3 papers published in reputable journals that claim the opposite. Knowing which papers are lacking and which aren't goes beyond what most of us were taught in high school.