Before You Buy a Lash Serum, Read the Ingredients — Here’s the Best-Seller We Trust

Brit+Co Staff on July 2, 2026

Lash serums are one of those products where the before-and-afters do all the marketing — but the ingredient list is what you should actually be reading. A lot of the serums that promise dramatic growth do it with prostaglandin analogs (look for names like isopropyl cloprostenate or bimatoprost). They can work, but some users report side effects like irritation, redness, darkening of the eyelid skin, or changes to the look of the eye area. If that gives you pause, you’re not alone — and it’s exactly why we went looking for a gentler option that people actually stick with.

Why the ingredient list matters here

The Terez & Honor Enhancing Eyelash & Brow Serum takes the drug-free route: instead of prostaglandins, it leans on a peptide-and-botanical formula — a 5-peptide complex plus Capixyl and naturally derived extracts (kelp, mulberry leaf, honeysuckle root) — to condition and support the look of fuller lashes and brows over time. The brand describes it as hypoallergenic, clinically tested, and dermatologist-reviewed, and suitable for all skin types. It’s the kind of formula that’s easier to feel good about using every day, right along your lash line and on sparse brows.

The best-seller part

This isn’t a hidden gem — it’s a genuine best-seller, with a 4.1-star rating across more than 10,000 reviews and a spot near the top of Amazon’s Eyelash Primers list. That kind of repeat-purchase volume is its own signal: people finish a tube and reorder. Terez & Honor points to a consumer study suggesting visibly fuller-looking lashes and brows over several weeks of twice-daily use; as with any lash serum, consistency is everything and individual results will vary.

A drug-free, peptide-based formula with 10,000+ reviews behind it — the rare lash serum whose ingredient list is a selling point, not a warning.Brit+Co Editors

How to use it

Using the precision applicator, sweep a thin line along the base of your upper lash line — think of it like applying a fine eyeliner — morning and night, and brush a little onto clean brows. A 3 mL tube is designed as roughly a six-week supply, so plan to reorder if you want to keep results going. Go slow if your eyes are sensitive, and stop if you notice any irritation.

Frequently asked questions

Does this serum contain prostaglandins?
No — Terez & Honor markets it as drug-free. Instead of prostaglandin analogs, it uses a peptide-and-botanical formula (a 5-peptide complex, Capixyl, and naturally derived extracts), which is the main reason it’s positioned as a gentler option.
How long until I see results?
The brand cites a consumer study pointing to visibly fuller-looking lashes and brows over several weeks of consistent twice-daily use. Lash serums reward consistency, and results vary from person to person.
Is it safe for sensitive skin?
It’s described as hypoallergenic, clinically tested, and dermatologist-reviewed, and suitable for all skin types. As with any eye-area product, do a patch test first and discontinue use if irritation occurs.