The Ordinary Lash Serum: Does It Work? Safety & Results

Anyone who’s spent time scrolling through lash serum reviews knows the feeling: each product promises thicker, longer lashes, but the fine print often mentions prostaglandins and a list of potential side effects that sound anything but cosmetic. The Ordinary Multi-Peptide Lash and Brow Serum takes a different route, swapping growth hormones for a peptide-based formula aimed at conditioning rather than forcing growth.

Product name: The Ordinary Multi-Peptide Lash and Brow Serum · Key active ingredients: 11 actives including 4 peptide complexes, caffeine, panthenol · Claimed benefit: Supports thicker, fuller, healthier-looking lashes and brows · Typical usage: Once or twice daily · Price range: Approximately $15–$20 USD for 5 ml

Six key specs, one pattern: the serum focuses on conditioning support rather than drug-level growth stimulation.

Does the ordinary eyelash serum really work?

What the formula contains

• 11 active ingredients, including 4 peptide complexes, caffeine, and panthenol (The Ordinary official product page)
• Peptides support keratin production for thicker, fuller lashes (Doctor-led review on YouTube)
• No prostaglandin analogs are listed (The Lash List safety guide)

Clinical evidence and user reviews

• User reviews on Deciem Chat Room and The Regular Folks report visible results in 4–8 weeks
• The product page contains testimonial claims of improvement in lash length and health (The Ordinary official product page)
• Independent reviewers note that results are more subtle than prostaglandin-based serums (Illuminate Labs review)

How long does ordinary eyelash serum take to work?

Typical timeline for visible results

• Most users report initial changes in 4–6 weeks (Deciem Chat Room timeline)
• Full results typically seen after 8–12 weeks of consistent use (Deciem Chat Room timeline)
• One user review noted a visible difference at week 5 (The Regular Folks user experience)

Factors that influence speed of results

• Individual lash growth cycle (natural cycle is 30–60 days) (The Lash List background)
• Application consistency: missing days delays progress (Illuminate Labs application notes)
• Twice-daily application may speed results but raises irritation odds (Deciem Chat Room twice-daily recommendation)

What are the side effects of ordinary lash serum?

Common side effects

• Mild irritation, redness, or itching around the eyes (Illuminate Labs review)
• Eyelid flakiness reported in one independent review for a sensitive-skin user (Illuminate Labs review)
• No prostaglandin analogs (common irritant in other serums) are listed in the formula (The Lash List ingredient analysis)

Rare or serious side effects

• Unlike prostaglandin-based serums, The Ordinary’s product has no documented cases of iris color change or orbital fat loss (The Lash List safety comparison)
• One user who previously used a prostaglandin serum reported no irritation with The Ordinary (The Regular Folks user comparison)
• Discontinue use if persistent irritation occurs and consult a doctor (Ophthalmologist video guidance)

Is it safe to use eyelash serum while pregnant?

General safety guidance for pregnancy

• The Ordinary does not explicitly recommend use during pregnancy or breastfeeding (The Ordinary official product page)
• Consult a healthcare provider before using any cosmetic serum during pregnancy (Ophthalmologist review on YouTube)
• Many dermatologists advise avoiding all non-essential topical products during the first trimester (The Lash List general pregnancy caution)

What the manufacturer says

• The formula is free of prostaglandins, which are often restricted in pregnancy (The Lash List ingredient safety)
• Still, no formal safety studies have been conducted on pregnant or breastfeeding populations (Deciem Chat Room disclaimer)
• Bottom line: not proven unsafe, but not proven safe either (Illuminate Labs pregnancy note)

Should I use the ordinary lash serum once or twice a day?

Recommended application frequency

• The manufacturer recommends once daily, preferably in the evening (The Ordinary official product page)
• Some users apply twice daily for faster results, but this may increase irritation risk (Illuminate Labs application advice)
• Deciem Chat Room states the brand recommends twice-daily use for the best results (Deciem Chat Room recommendation)

Best practices for application

• Apply a thin line along the upper lash line, avoiding direct contact with eyes (The Ordinary usage instructions)
• Use the supplied applicator; do not double-dip (Deciem Chat Room hygiene tip)
• Can also be brushed onto brows (The Ordinary official product page)

Eight application steps, one recommendation: consistent daily use trumps occasional over-application.

1. Wash face and remove all eye makeup.
2. Ensure lashes are clean and dry.
3. Open the serum tube and dip the applicator into the formula.
4. Draw a thin, even line along the upper lash line (like eyeliner).
5. Do not apply to lower lashes or waterline.
6. Allow 1–2 minutes for the serum to dry before other products.
7. Repeat once daily; increase to twice daily only if skin tolerates it.
8. Store at room temperature, away from direct sunlight.

“The Ordinary Multi-Peptide Lash and Brow Serum supports thicker, fuller, healthier-looking lashes and brows.”

— The Ordinary official product page

“I used a prostaglandin serum before and had lid irritation. Switched to The Ordinary — no redness, no flaking, and after 6 weeks lashes do look a bit longer.”

— User review on The Regular Folks

For anyone weighing a lash serum purchase, the choice is not between good and bad but between speed and safety. The Ordinary’s peptide-based formula delivers softer, gradual results with a lower side-effect profile — but women who are pregnant or nursing face an unlabeled risk. The verdict: if you want reliable conditioning without the prostaglandin gamble, The Ordinary lash serum is a solid bet. For those seeking dramatic growth or who are expecting, alternative options or a doctor’s input come first.

Related reading: The Ordinary Lash & Brow Serum review · lash serum side effects

For a comprehensive overview of its performance and potential side effects, you can check out a detailed German review of this serum.

Frequently asked questions