5 Common Lash Serum Mistakes (That Can Ruin Your Results)

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Wednesday, October 15, 2025 in LASHES

5 Common Lash Serum Mistakes (That Can Ruin Your Results)

(And how to finally get the lashes you’ve been hoping for)

Written by Teresa Mendoza

Former makeup artist & lash extension wearer for 15+ years

I thought my lash story was over.

Years of mascara, curlers, extensions, and removers had left them thin, brittle, and barely visible.

I tried everything from expensive salon serums, trendy online picks, even “natural” oils but nothing made a real difference.

Then I spoke with Sarah Chen, a beauty formulator for Liaison who’s helped thousands of women over 45 get results from lash serums. She told me:

“Many lash serums can work, but women often make small mistakes that cancel out their results. Fix those, and your lashes have a much better chance to come back stronger.”

Here are the five most common mistakes Sarah sees and how to avoid them so you can finally see thicker, healthier lashes in the mirror.

1. Not Checking the Ingredients

Pretty packaging doesn’t always mean a formula works. Many serums skip the actives your lashes actually need.

Sarah explains:

“The best formulas combine repair, nourishment, and strengthening in one, especially for mature lashes.”

What to Do Instead:

Switch to a formula that’s built for real repair. One that combines peptides, EPM Enzyme, sodium chloride, and citric acid. These ingredients work together to reach the root of the lash, where they can actually stimulate stronger, healthier growth.

Products like Lash Root Activator are a great example. It uses advanced peptide technology along with follicle-cleansing and pH-balancing actives to support growth from the inside out. We also found it’s currently 50% off for first-time buyers.

“I used to pick serums by the bottle design. Once I learned to look for peptides and EPM Enzyme, I switched to Lash Root Activator and my before-and-after photos are proof it works!” – Patricia, 60

2. Using Harsh Formulas

Some lash serums contain hormone-like ingredients that can cause redness, itching, or even visible dark patches along the lash line — especially on thinner, mature skin.

Sarah warns:

“You want power without irritation. A formula can be effective without being harsh.”

What to Do Instead:

Look for a lash serum that’s free from prostaglandins, parabens, sulfates, silicones, and artificial fragrance. Instead, it should rely on gentle, plant-based peptides and nutrient-rich actives to support healthy growth without causing sensitivity.

And if you can find one that’s proven to deliver results without irritation, it’s worth the switch. Products like Lash Root Activator are a great example. It’s made with peptides that help rebuild lash strength, along with soothing, non-irritating botanicals so you can use it nightly without redness or discomfort. Right now, it’s also available at 50% off for first-time buyers.

“I had a bad reaction to another lash serum years ago and avoided them ever since. A friend convinced me to try Lash Root Activator because it’s gentle. No redness, no itching, just softer, thicker lashes within weeks.” – Elaine, 59

3. Expecting Results Too Soon

When nothing happens after two or three weeks, it’s tempting to give up. But lashes grow in cycles and at 50+, that cycle is slower, meaning visible changes take more time.

Sarah explains:

“If you stop too early, you interrupt the process before the follicle can produce a full lash.”

What to Do Instead:

Stick with a serum for at least one full growth cycle, usually 8–12 weeks. The first few weeks are about feeding and repairing the follicle so it’s ready to grow a stronger lash. Visible length and fullness often come later in the cycle.

Choosing a serum that’s built to work through every stage of the lash cycle can make all the difference. Products like Lash Root Activator are a great example. It uses a three-step Lash Bond Technology: Protein Repair, Enhanced Nourishment, and Nutrient Support. This technology works through each stage of the lash cycle. Most women start to notice changes in as little as 4 weeks, with full results by week 12. It’s also available at 50% off for first-time buyers.

“I nearly quit after three weeks because I didn’t see a difference. By week five, my lashes were darker and thicker at the base. By three months, they were so long I had to change how I put on mascara.” – Renee, 57

4. Skipping Days

Missing applications can slow or even reverse your progress. Every skipped night interrupts the lash growth cycle, much like missing too many workouts can stall your fitness goals.

Sarah says:

“Daily application keeps the follicle consistently nourished so new lashes can grow in stronger and last longer.”

What to Do Instead:

Make your serum part of your nightly routine. Keep it next to your toothbrush or skincare so it’s always in sight. If you travel, pack a second tube in your overnight bag so you never miss a night.

The easier it is to apply, the more likely you’ll stay consistent. Products like Lash Root Activator are a great example. It takes less than 10 seconds to apply, dries quickly, and feels weightless, making it easy to stay consistent. And right now, it’s available at 50% off for first-time buyers.

“I used to forget for days, then wonder why nothing changed. Once I used it every night, my lashes became fuller and stronger in two months.” — Marjorie, 63

5. Applying It Like Mascara

One of the most common mistakes women make with lash serums is brushing the product onto their lash tips like mascara. While it might feel natural, it completely misses the part of the lash that actually grows.

Sarah explains:

“Lash growth starts in the follicle, which sits right along your lash line. If the serum doesn’t touch that skin, it can’t feed new growth.”

What to Do Instead:

Apply a thin line of serum along your upper lash line, just like liquid eyeliner. This ensures the active ingredients reach the follicle where they can do their work. Always start with a clean, dry face and let the serum dry before applying other products.

Using a serum with a precision-tip applicator makes it easy to place the formula exactly where it’s needed. Products like Lash Root Activator are a great example. Its precision brush makes it easy to deliver the right amount of product exactly where it’s needed. Used correctly, it can help new lashes grow stronger and fuller. It’s also available at 50% off for first-time buyers.

“I used to apply lash serum like mascara and never saw a change. Once I started lining it along my lash line, I noticed growth within weeks.” – Gloria, 61

The Bottom Line

These mistakes are easy to make but once you fix them, the difference can be dramatic. With the right formula, applied the right way, and the patience to see it through, lashes at 50, 60, or beyond can look lush again.

Exclusive for You: Get 50% off your first bottle of Lash Root Activator today. Start now, and in as little as 4 weeks, you could see a visible difference.