Prostaglandin-Free Lash Serums Explained: What the Ingredient List Actually Tells You

A prostaglandin-free lash serum is one whose ingredient list contains no prostaglandin analogue — no isopropyl cloprostenate, no dechloro dihydroxy difluoro ethylcloprostenolamide, no bimatoprost. In Australia every cosmetic must print its ingredients on the pack in INCI order, so the ingredient list, not the marketing on the front of the box, is where you confirm it.

"Prostaglandin-free" is one of the most repeated phrases in the Australian lash aisle, and one of the least explained. Below: how to recognise a prostaglandin analogue by its INCI name, what the regulatory record says about that ingredient class, and what peptide formulas do instead. No brand names — you shouldn't have to trust a label claim when you can check it yourself.

What does "prostaglandin-free" actually mean?

Prostaglandins are signalling molecules the body makes naturally. Chemists have made synthetic versions — prostaglandin analogues — which are the active substances in prescription eye medicines used to lower pressure inside the eye. One of them, bimatoprost, was also supplied in Australia as a prescription eyelash product under the brand Latisse, until that entry was cancelled from the Australian Register of Therapeutic Goods on 24 April 2017.

Close chemical cousins of those prescription molecules later appeared in over-the-counter lash cosmetics — no prescription, no ARTG listing, and often no idea on the shopper's part what they were applying nightly.

So "prostaglandin-free" is a composition statement, not a performance claim. It describes what is in the bottle and says nothing about how well a product works.

How to find the ingredient list on an Australian lash serum

The Consumer Goods (Cosmetics) Information Standard 2020 requires cosmetic ingredients to be listed on the container or the product itself, in descending order of volume or mass, using INCI or common English names. In practice:

• On the pack. A product arriving with no ingredient list anywhere on it is a compliance problem in itself.
• On the product page. Not legally required, but a brand publishing the full INCI list online has nothing to hide. "Our hero peptide blend" is a marketing summary, not an ingredient list.
• In order. Most to least by volume. An active listed after the fragrance and preservative is present at a very small percentage.
• On the right label. An overseas listing may show a pack written for another market. Check the physical carton.

The naming pattern that gives prostaglandin analogues away

You don't need to memorise every molecule. Prostaglandin analogues nearly always carry a giveaway fragment in the INCI name:

• -prost- anywhere in the word
• endings such as -prostenate, -prostenolamide, -prostamide, -prostal
• the fragments cloprosten, tafluprost, noralfaprostal

A long chemical name is not automatically a concern — sodium hyaluronate is long too. It is the "prost" family you are scanning for.

Prostaglandin-analogue INCI names to look for on a label

Not exhaustive: the EU ingredient database lists more than a dozen synthetic prostaglandin analogues. Use the naming pattern as your first filter.

Why some shoppers choose to avoid this ingredient class

European Union. On 2 February 2026 the European Commission's Scientific Committee on Consumer Safety adopted its final opinion (SCCS/1680/25) on three prostaglandin analogues used in lash and brow cosmetics — MDN, isopropyl cloprostenate and DDDE. It concluded that none of them "can be considered safe" for that cosmetic use, citing pharmacological potency at low concentrations and insufficient data to rule out reproductive and developmental effects in users who are most likely women of child-bearing age.

Canada. Health Canada's Cosmetic Ingredient Hotlist places "prostaglandins, their salts and derivatives and their analogs" in the prohibited column, naming bimatoprost, cloprostenol, latanoprost, tafluprost and travoprost among others.

Australia. Our position is structured differently, and worth understanding rather than misquoting: Australia publishes no Health-Canada-style prohibited cosmetic ingredient list for this class. Two separate controls apply instead. Cosmetic ingredients are regulated as industrial chemicals by AICIS, and importers and manufacturers must be registered and categorise each introduction. Separately, the TGA draws the cosmetic-versus-therapeutic line using a product's purpose, its ingredients and its claims — so a product claiming to make hair physically longer, rather than longer-looking, is a therapeutic good that must be on the ARTG before it is supplied or advertised.

The literature. A 2024 review in the Journal of Cosmetic Dermatology reported the strongest evidence base for prescription bimatoprost, said other prostaglandin ingredients warrant further study, and was equally candid that non-prostaglandin ingredients show promising data but lack formal studies specific to lash use. An honest picture of the whole aisle — ours included.

What peptide, biotin and panthenol formulas do instead

A prostaglandin-free serum is a conditioning cosmetic: it cares for the lashes and the skin along the lash line so hair looks and feels better.

Peptides

Peptides are short chains of amino acids, listed as Myristoyl Pentapeptide-17, Myristoyl Hexapeptide-16, Acetyl Tetrapeptide-3 or Biotinoyl Tripeptide-1 and used as hair-conditioning agents. A well-conditioned lash reflects light more evenly and holds a curl better, which reads as darker, fuller-looking lashes.

Biotin, panthenol and humectants

Biotin is vitamin B7, used as a conditioning agent. Panthenol (provitamin B5) is a humectant that draws in and holds water, which is why conditioned hair feels softer and looks smoother rather than dull and brittle. Sodium hyaluronate, glycerin and amino acids hydrate the lash line; mild botanicals add comfort.

What to expect, honestly

Conditioning works on the hair you already have. It is gradual, cumulative, and it stops when you stop. Most people using a nightly serum look for a change in the appearance of their lashes over roughly four to eight weeks. Anything promising something dramatic in days is telling you more about its marketing than its formula.

A five-minute label check before you buy

1. Find the full INCI list on the product page, or ask the brand. If nobody will show you the list, that is your answer.
2. Scan for "prost" and for the names in the table above.
3. Check the order. Peptides near the end of the list are present in tiny amounts — normal, but claims should match.
4. Read the claims against the TGA line. A cosmetic talks about appearance; a therapeutic claim needs an ARTG entry.
5. Look for the boring detail — directions, patch-test advice, a contact address, an ABN.

Where our formulas sit

LashOriginals serums are formulated without prostaglandin analogues. Our Lash Serum is an ophthalmologist-tested, peptide-based conditioning serum for longer-looking, fuller-looking lashes; the Eyebrow Serum conditions brow hairs and the skin beneath them; the Scalp & Root Serum is a root-conditioning formula for fuller-looking hair. Each page carries its full ingredient list, so run the check above on us before you buy. Directions and patch-test guidance are on our safety and usage page.

Frequently asked questions

What does prostaglandin-free mean on a lash serum?

It means the formula contains no prostaglandin analogue — the class of synthetic molecules related to prescription eye medicines, such as isopropyl cloprostenate. It describes composition, not performance, and you confirm it on the ingredient list.

Which lash serum ingredients are prostaglandin analogues?

The names most often seen on cosmetic labels are isopropyl cloprostenate, dechloro dihydroxy difluoro ethylcloprostenolamide (DDDE), methylamido dihydro noralfaprostal, ethyl tafluprostamide and trifluoromethyl dechloro ethylprostenolamide. Bimatoprost, latanoprost and travoprost belong to prescription medicines, not cosmetics.

Is isopropyl cloprostenate allowed in cosmetics in Australia?

Australia publishes no prohibited cosmetic ingredient list of the Canadian kind. Ingredients here are regulated as industrial chemicals by AICIS, and the TGA separately classifies a product as a therapeutic good — requiring ARTG entry before supply or advertising — when its purpose, ingredients or claims cross the cosmetic line. Health Canada prohibits prostaglandin analogues in cosmetics; the EU's SCCS concluded in February 2026 that three of them cannot be considered safe for lash and brow use.

How can I tell if my lash serum contains a prostaglandin analogue?

Scan the INCI list for "prost" and the endings -prostenate, -prostenolamide, -prostamide and -prostal. Also check for isopropanol phenyl hydroxyl pentene dihydroxy cyclopentane heptenate, a prostaglandin-type molecule whose name contains no "prost".

Do peptide lash serums work the same way as prostaglandin ones?

No, and no honest brand should say they do. Peptide serums are conditioning cosmetics: they care for the lash and lash line so hair looks fuller and feels softer. Prostaglandin analogues are pharmacologically active molecules in the same family as prescription eye medicines — a different category entirely.

Why won't some brands publish their full ingredient list online?

Australian law requires the list on the pack, not the website, so a brand can sell legally without publishing it online. If one won't send you the INCI list when you ask, buy from a brand that will.

Are LashOriginals serums prostaglandin-free?

Yes. Our lash, brow and scalp serums are formulated without prostaglandin analogues, and the full ingredient list for each is published on its product page so you can verify it rather than take it on trust.

Can I use a prostaglandin-free lash serum with lash extensions?

Generally yes, but apply to a clean, dry lash line and let it dry fully before the lashes are touched, since oils and residue can affect adhesive. Check your specific adhesive with your technician, and see our safety and usage page.

Browse: our prostaglandin-free lash range.

Related reading

• How to Apply a Lash Serum (and the Mistakes That Waste a Tube)
• The same label check, applied to brow serums
• Prostaglandin Lash Serums: Side Effects & Safer Alternatives
• Latisse vs Over-the-Counter Lash Serums in Australia
• Best Eyelash Serum in Australia (2026)

Sources

• SCCS, Opinion on Prostaglandin Analogues (MDN, IPCP, DDDE), SCCS/1680/25, adopted 2 February 2026 — health.ec.europa.eu
• Health Canada, Cosmetic Ingredient Hotlist — canada.ca
• TGA, Determining if your product is a cosmetic or a therapeutic good — tga.gov.au
• TGA, Latisse (bimatoprost 0.3 mg/mL) cancelled from the ARTG, 24 April 2017 — tga.gov.au
• AICIS, Cosmetics and soap — industrialchemicals.gov.au
• ACCC Product Safety, Cosmetics ingredients labelling mandatory standard — productsafety.gov.au
• European Commission, CosIng ingredient database — single-market-economy.ec.europa.eu
• Cosmetic Ingredient Review, Ethyl Tafluprostamide and Isopropyl Cloprostenate safety assessment — cir-safety.org (PDF)
• Baiyasi M, et al. Eyelash serums: A comprehensive review. J Cosmet Dermatol. 2024;23(7):2328–2344 — PubMed 38475901

General information about ingredient labelling, not medical advice. If you have an eye condition, use prescription eye medicine, or are pregnant or breastfeeding, speak to your doctor before using any product near the eye.