Social media decided the FDA just approved BPC-157, TB-500, and four other peptides. That's not what happened, and Dr. Leigh Baxt is the right person to explain why.
Baxt is a translational scientist and drug development lead with training from Stanford, Harvard, and Brown. She walks Spencer and Karl through the actual language, which amounts to a double negative. These peptides were not added to the 503A bulks list and they did not become approved drugs. The FDA simply said it won't enforce the restriction on compounding pharmacies making them. Nothing was legalized. No rules changed. For context, only about five or six substances have been added to that list in 25 years, and nearly all of them were topical, not injectable.
From there she lays out what real drug development looks like, and it's the clearest explanation of the process this show has run. Years of molecular work before an animal ever sees the compound. Preclinical toxicology and safety pharmacology designed specifically to prove you aren't causing harm. Chronic dosing studies, tumor growth, metastasis. Five or six years and millions of dollars just to earn permission to test in a human. Her number for how often it works: roughly 173 projects for one approved drug.
She also dismantles the arguments you've probably heard. Patents aren't the reason pharma isn't developing these, because most of them are patented, and some companies let those patents lapse after walking away, which tells you something. Natural doesn't mean safe, because insulin is natural too. Peer-reviewed basic science is not the same thing as therapeutic development data. And if you go looking at clinical trial registries yourself, she explains what she found when she pulled up the TB-500 listing. One word in that entry is worth the whole segment.
The conversation closes on what actually worries her, and it isn't the acute reactions making headlines. It's what shows up in 20 years, and the fact that no oncologist is going to connect it back.
Nobody here is defending the FDA as perfect. Spencer's line, borrowed from Ben Goldacre, sums up the episode: 747s aren't perfect, but that doesn't mean magic carpets are the way to fly.
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