Peptides for hormone imbalance and brain chemistry: what the evidence says

What did @howtostaypretty actually say?

The creator describes getting injected with LL-37, BPC-157, and TB-500 at a clinic, then frames nearly every psychiatric and neurological condition, including anxiety, depression, bipolar disorder, and mold sickness, as ultimately rooted in hormone imbalance that then disrupts brain chemistry. "No matter what we're talking about, we're always going back to brain chemistry and always going back to hormones," she says. She also dismisses a normal hormone panel from her doctor, rejects a Prozac prescription, and describes SSRIs as simply giving you "more of the hormone that makes your brain run properly."

The core argument is that mold exposure, trauma, and bad environments all share a common pathway through hormones to produce psychiatric symptoms. It's an oversimplified but not entirely made-up idea, and the framing matters enormously for how people watching this make decisions about their own care.

Does the science back this up?

Partially, and with important caveats the video skips entirely. Mycotoxin exposure from certain mold species has been associated with neuroendocrine disruption in some studies, but the evidence is far from the clean causal chain she's describing.

A 2013 review by Crago et al. in the Archives of Environmental and Occupational Health found associations between water-damaged building exposure and symptoms including cognitive impairment and fatigue, but establishing a direct hormonal mechanism remains difficult. Separately, the HPA axis, which governs cortisol release, is genuinely affected by chronic stress, trauma, and PTSD (Yehuda et al., 2015, Biological Psychiatry). So trauma affecting hormones affecting brain function is a real pathway, just not the tidy universal one she presents.

Where the logic breaks down is in flattening all psychiatric diagnoses into a single hormonal explanation. Bipolar disorder, for instance, has a strong genetic architecture. A 2021 genome-wide association study in Nature Genetics identified over 60 loci linked to bipolar risk. Cortisol dysregulation plays a role in some cases, but it is not the root cause in any settled scientific sense.

What did they get wrong (or right)?

She gets partial credit for recognizing that the HPA axis connects stress, environment, and mood. That is real physiology. Chronic mold exposure producing systemic inflammation that affects mood and cognition? Plausible. Trauma dysregulating cortisol and contributing to depression and anxiety? Well-documented.

But three things here are genuinely wrong or reckless. First, dismissing a normal hormone panel because a specialist might find something different is not unreasonable on its face, but framing standard psychiatric care as a dead end while implying peptide injections are the real solution is a problem. Second, her description of Prozac, "all it does is give you more of the hormone that makes your brain run properly," is just incorrect. SSRIs work primarily by blocking serotonin reuptake at the synapse. Serotonin is a neurotransmitter, not a hormone, and the mechanism is substantially more complex than a simple top-up. Third, LL-37 is an antimicrobial peptide being studied in preclinical and early-phase research. Injecting it based on a mold-sickness self-diagnosis, at a clinic, without discussing its actual evidence base, is not something the current literature supports as standard of care.

What should you actually know?

If you are dealing with brain fog, mood instability, or suspect mold exposure, there are legitimate clinical pathways worth knowing about, and they do not require rejecting conventional medicine entirely.

• Mold-related illness is real but contested in its scope. Clinicians disagree on which symptoms qualify and how to diagnose it. The American Academy of Allergy, Asthma and Immunology has noted that the term "toxic mold syndrome" is not supported by current evidence as a distinct diagnosis.
• BPC-157 and TB-500 have shown tissue-repair and anti-inflammatory effects in rodent studies, but human clinical trial data is limited. Neither has FDA approval for any indication.
• LL-37 has antimicrobial and immunomodulatory properties studied in wound healing contexts. Its use as an injection for mold-related symptoms is not supported by published clinical evidence.
• If a standard hormone panel came back normal and symptoms persist, a second opinion from an endocrinologist is reasonable. That is different from concluding the entire testing framework is wrong.
• Rejecting an SSRI prescription is a personal choice, but the reasoning here, that Prozac just gives you a hormone, gets the pharmacology wrong and could discourage people from a treatment that has substantial evidence behind it for the conditions she mentions.

The bottom line

This video gestures at real biology but oversimplifies it into a framework that conveniently explains everything and, just as conveniently, points toward peptide therapy as the answer. The creator seems to genuinely believe what she is saying, and some of it has a foundation in real science. But the leaps from mold exposure to universal hormone theory to dismissing psychiatric diagnoses and standard pharmacology are significant. Watch this with a skeptical eye, and loop in a physician before drawing any conclusions about your own brain chemistry.