Lash serums fall into two groups: conditioning serums with ingredients such as peptides and panthenol, and serums containing prostaglandin analogues, which are drug-type ingredients. Read the ingredient list before you buy, because the two carry very different risks around the eye.
What are the two types?
| Conditioning serum | Prostaglandin-type serum | |
|---|---|---|
| Typical ingredients | Peptides, panthenol, biotin | Names ending in -prost or -prostenate |
| Used for | Soft, conditioned lashes | Drug-type effect on lash growth |
| Main concern | Irritation | Side effects around the eye |
| Check | Ingredient list | Speak to a health professional first |
Why do prostaglandin analogues matter?
Bimatoprost is the active ingredient in Lumigan eye drops, a medicine in New Zealand. A 2024 review of eyelash serums discusses prostaglandin-type serums, and trade coverage of that review notes side effects that include fat loss around the eye. A 2026 narrative review says these ingredients have been found in commercial serums, in some cases undeclared.
What about peptide lash serums?
Peptide lash serums are sold as cosmetics, so what they can say is limited to how lashes look and feel. Our guide to peptides in skincare explains what the ingredient names mean.
How is it used?
Follow the directions. Apply to clean, dry skin along the lash line, keep it out of the eyes, and patch test first if your skin reacts easily.
Common questions
How do I spot a prostaglandin analogue on a label?
Look for names ending in -prost or -prostenate, such as isopropyl cloprostenate, dechloro dihydroxy difluoro ethylcloprostenolamide or bimatoprost. If you are unsure, ask the seller or a pharmacist.
Can I use lash serum with contact lenses?
Follow the product's directions. Remove lenses first and keep the serum out of your eyes.
Can I use a lash serum on my brows?
Only if the label says so. Stop using any serum that stings or irritates, and see a health professional if it does not settle.