“Peptide-powered” is on the front of a lot of lash serums now, but the word on its own doesn't tell you much. Peptides are short chains of amino acids, the building blocks of proteins like keratin (what your lashes are made of). The question that matters is which peptides a serum uses, and whether they're backed by real research. Here's a plain-English guide.
Why peptides instead of prostaglandins
Peptides are the heart of the prostaglandin-free approach. Rather than driving growth the way a prostaglandin analog does, with its associated side effects, peptides work with your lashes' own biology to support strength, resilience, and a fuller look, with a gentler profile for the eye area.
The peptides worth knowing
- Myristoyl Pentapeptide-17 — one of the most studied lash/brow peptides; associated in cosmetic research with supporting keratin and the look of fuller lashes.
- Biotinoyl Tripeptide-1 — a biotin-linked peptide used to support conditioning and the appearance of stronger lashes.
- Acetyl Tetrapeptide-3 — studied for supporting the follicle environment and the look of denser lashes.
A good peptide serum usually pairs one or more of these with supporting conditioners — panthenol, hyaluronic acid, and botanical extracts — that keep lashes hydrated and reduce breakage.
How to evaluate a peptide serum
- Named peptides, not just “peptide complex.” The label should tell you what's in it.
- Prostaglandin-free, so you get the peptide benefits without the “-prost” side-effect profile.
- Formulated and tested to current cosmetic safety standards.
- A brand that explains its formula rather than hiding behind marketing language.
Boru's approach
Boru is built around a peptide and botanical complex, prostaglandin-free by design, and made in the USA to current cosmetic safety and MoCRA standards. We're formulating professional-first, for the estheticians and lash artists whose clients ask for fuller lashes without the irritation. Learn more about how prostaglandin-free serums work, check the prostaglandin side-effect guide, or join the launch list.
General education, not medical advice. Ingredient effects vary by person and formulation; always follow the product label.