Peptide therapy for women over 40: what the science actually supports

What did @staceysaldarriaga actually say?

She laid out three sourcing pathways for peptides: your regular physician (including med spas for B12 and glutathione injections), a telehealth platform that writes prescriptions routed to compounding pharmacies, and research laboratories that sell peptides labeled "for research purposes only." She was upfront that some peptides are not FDA-approved and that research labs occupy a legal gray zone, noting some operate overseas. She also floated the idea that RFK Jr. is involved in reshaping peptide regulations.

Her framing was broadly cautious and she deserves credit for explaining the sourcing landscape without outright pushing viewers toward unregulated products. But the research lab section was described in a tone that was a little too even-handed given the actual safety picture.

Does the science back this up?

The three-tier sourcing model she describes is a real and documented structure. Compounding pharmacies, when operating under 503A or 503B FDA designations, are legitimate dispensing entities. Research labs, by contrast, are not authorized to sell peptides for human use regardless of what the label says.

On glutathione: intravenous glutathione is used in clinical settings, but evidence for its efficacy as a wellness injection is thin. A 2015 review by Pizzorno in Integrative Medicine found that oral and IV glutathione can raise systemic levels, but clinical outcomes in otherwise healthy people are not well established. B12 injections have solid support for people with documented deficiency (Stabler, 2013, New England Journal of Medicine), but are frequently administered to people who are not deficient, where benefit is debatable. The claim that these are "very common" and safe is accurate in clinical contexts. The implication that they are broadly beneficial for everyone over 40 is not supported by evidence.

What did they get wrong (or right)?

She got the structural description mostly right. Physicians can prescribe certain peptides. Compounding pharmacies can legally formulate FDA-approved or designated substances. Research labs are not legal sources for human-use products. All of that checks out.

Where she was misleading: describing research labs as "basically laboratories that are formulating and manufacturing peptides" without emphasizing that purchasing from them for self-injection is not just legally ambiguous but potentially dangerous. Peptides sourced from unregulated labs have no guaranteed sterility, purity, or accurate concentration. A 2021 study by Cohen et al. in JAMA Internal Medicine found that products sold as peptides or research chemicals frequently contain unlisted ingredients or incorrect dosages. That is not a minor footnote.

The RFK Jr. comment is unverifiable as a regulatory claim and should not be treated as actionable information. There is no finalized regulatory change as of this writing that has restored access to previously restricted peptides.

What should you actually know?

The peptide category is not monolithic. Some peptides, like certain growth hormone-releasing peptides, were compoundable until the FDA added them to a restricted list in 2023. Others were never approved. The legal status of a specific peptide changes and the creator is correct that this is genuinely confusing territory.

What she underweighted is that "not FDA-approved" and "safe to self-inject from a random lab" are two very different things. Supplements not requiring FDA approval are ingested. Injectable compounds bypass your gut barrier entirely, which means contamination or misdosing has a faster and more direct route to causing harm. If you are considering peptide therapy, a licensed provider on a regulated platform who routes your prescription through a licensed compounding pharmacy is not just a convenient option. It is the only pathway that includes actual quality controls.