The Science
The biology first. The product second.
The lash category is full of confident claims and short on evidence. This is where we answer the real questions: what peptides can and can't do, how we label clinical evidence, how lashes actually grow, and why every RUSKI serum is prostaglandin-free. We answer plainly, with the limitations named.
Peptide science
Peptides for lashes, what they are and what the evidence shows
Peptides are the most credible, and most over-sold, ingredient class in lash care. What they can and can’t do, by INCI, with the honest evidence.
Read →Lash biology
Lash biology and the growth cycle
How eyelashes are built, how the lash growth cycle works, why lashes stay short, what makes them shed, and what conditioning can and can’t change.
Read →Lash serum safety
Prostaglandin-free, explained, why we leave them out
What prostaglandin analogues are, the side effects the medical literature documents, how to spot them on a label, and why every RUSKI serum leaves them out.
Read →Extension-safe care
Extension-safe lash care: cleansing, serums and recovery
Why cleansing drives extension retention, which lash products are oil-free and extension-safe, and how to care for your natural lashes in recovery.
Read →Ingredient literacy
How to read a lash serum label
A plain-English guide to INCI lists, ingredient order, peptide names and the claims a cosmetic label can and cannot support.
Read →Peptide library
Peptide Library, the sequences behind RUSKI lash care
A plain library of the peptides we name by INCI: Copper Tripeptide-1 (GHK-Cu), MP-17, MH-16, Biotinoyl Tripeptide-1 and Acetyl Tetrapeptide-3 - with S/M/E/T evidence labels.
Read →Evidence hub
Clinical Evidence, how RUSKI labels what we know
How we grade finished-product panels, manufacturer dossiers, published studies and consensus, including RL-LGS-001, RL-RRS-002 and RL-BDS-003 panels on request, with S/M/E/T labels.
Read →Hero actives
The peptide platform at a glance
Disclosed lead actives across the published range - appearance and conditioning language only, with evidence limits named on each product page.
Lash science, defined
A plain-language glossary of the peptide and lash-biology terms you will meet across these pages and our labels.
Open the glossary