Does Plexaderm Last As Long As Peter Thomas Roth? Comparing Effectiveness and Duration

by: Linda Robison / Facial Fitness Specialist @ ABZ

Wondering which under-eye serum lasts longer—Plexaderm or Peter Thomas Roth? Me too! So let’s break it down.

Both Plexaderm Rapid Reduction Serum and Peter Thomas Roth FirmX are top under-eye serums used for reducing puffiness and wrinkles. But how long do their effects last?

Here at ABZ we’ll break it to see which delivers the best all-day results.

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How does Plexaderm work?

Plexaderm creates an instant tightening effect using sodium silicate, forming a temporary film that smooths out puffiness and fine lines. But since it doesn’t hydrate, results can fade within 6-8 hours—or even faster if you have oily skin or make frequent facial movements.

✔ Pro Tip: For better results consider layering it with a hydrating eye cream from my best eye wrinkle treatments roundup.

Why do results fade?

Plexaderm works by using sodium silicate, which creates a tight film on the skin. This film temporarily tightens and reduces puffiness but may break down over time.

Pros:

• Fast results 
• Easy application
• Discreet, clear formula

Cons:

• Effects fade after a few hours (around 6-8 hours)
• May leave residue if over-applied

How does Peter Thomas Roth work?

Peter Thomas Roth FirmX results typically last between 6-10 hours. The flexible film-forming polymers provide a smoother finish than Plexaderm, allowing for more natural facial movement. The added hydration from hyaluronic acid helps maintain results longer, especially on dry skin.

Why do results fade?

Peter Thomas Roth uses film-forming polymers, peptides, and hyaluronic acid. It tightens and reduces under-eye puffiness within minutes.

Pros:

• Hydrates while tightening
• Smooth finish
• Dries quickly

Cons:

• Results are temporary
• May require reapplication
• Requires proper application to avoid residue

Which eye serum lasts longer?

When comparing Plexaderm and Peter Thomas Roth FirmX, their longevity depends on the active ingredients and how they interact with your skin type.

• Plexaderm uses silicate minerals to create a temporary tightening effect, visibly reducing puffiness and fine lines within minutes. However, since it lacks hydration, its effects typically last 6–8 hours before breaking down, especially with facial movements.
• Peter Thomas Roth FirmX relies on flexible film-forming polymers, peptides, and hyaluronic acid to tighten and hydrate at the same time. While the exact duration varies, users report it lasts 6–10 hours, with hydration helping maintain a smoother finish for longer.

Which One Should You Choose?

• For deeper under-eye bags and more dramatic tightening, Plexaderm provides stronger results but may feel dry and stiff.
• For mild puffiness, fine lines, or sensitive skin, Peter Thomas Roth FirmX offers a more natural, flexible feel with hydration for added longevity.

Both serums are temporary solutions, but FirmX tends to last a bit longer due to its moisturizing formula, while Plexaderm provides a more intense, short-term tightening effect.

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Application and tips for long lasting results

Both Plexaderm and Peter Thomas Roth require careful application to get the best, longest-lasting results.

Here’s how to apply them for optimal effectiveness:

1. Start with clean dry skin. This is key for best results!
2. Apply a small amount directly to the under-eye area using your fingertip.
3. Gently pat or tap the product in—don’t rub—until fully absorbed.
4. Keep your face expressionless for about 5-10 minutes while the product dries to avoid disrupting the tightening effect.
5. Avoid over-applying, as a little goes a long way.

General Tips:

• Skin Type: Oily skin can cause the product to break down faster, while dry skin may enhance longevity.
• Amount: Apply only a small amount to avoid a cakey finish.
• Touching or Rubbing: Try not to touch or rub your eyes after application, as this can cause the product to wear off more quickly.
• Choose an Eyeliner and concealer That Won’t Settle Into Fine Lines – The wrong eyeliner can emphasize under-eye creases, making puffiness more noticeable. If you're looking for smudge-proof options that flatter mature eyes, check out my best eyeliners tips for aging eyes.

My experience & reviews:

In my personal trials, both products temporarily reduced puffiness and smoothed fine lines, but I found Plexaderm a bit drying on my sensitive skin, while Peter Thomas Roth FirmX provided a smoother, softer finish.

User feedback generally supports these observations:

Some report that Plexaderm’s formula feels drying and can flake with facial movements, while Peter Thomas Roth FirmX is often praised for its flexibility, smoother feel, and longer-lasting effects.

Which eye gel/serum should you try?

Since there aren’t direct comparisons between how long Plexaderm lasts compared to Peter Thomas Roth FirmX, finding the best under-eye serum for your needs will come down to personal preference and a bit of trial and error.

Here’s a helpful guide to choose the right one for you:

• Heavy under-eye bags or deep wrinkles: Plexaderm works well with its strong tightening effect, making it ideal for more noticeable puffiness and deeper fine lines.
• Mild puffiness, fine lines, or sensitive skin: Peter Thomas Roth FirmX is a better option for those with lighter puffiness. Its formula hydrates and smooths, making it a great choice for delicate under-eye areas.

Ultimately, the right serum for you depends on your skin type and what works best for your unique needs.

Studies about key ingredients

Sodium silicate offers a quick tightening effect but may not last long due to its rigidity, while film-forming polymers create a flexible, breathable layer that lasts longer and helps with moisture retention.

Overall, film-forming polymers tend to maintain their effects longer than sodium silicate (Cosmetics and Toiletries, 2024 ; Prequel, 2024 ).

Final takeaway: 

Plexaderm Rapid Reduction Eye Serum gives a fast, noticeable tightening effect, ideal for heavier bags or deep wrinkles, but its results typically last 6–8 hours and may fade with facial movements. It’s best for quick fixes but may need touch-ups.

Peter Thomas Roth FirmX offers hydration and flexibility, making it last a bit longer. It’s great for lighter puffiness, fine lines, or sensitive skin, but doesn’t have the same dramatic effect as Plexaderm.

For deeper bags or wrinkles, go with Plexaderm. For milder puffiness or sensitive skin, Peter Thomas Roth is the better choice.

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FAQ: How long does Plexaderm last vs. Peter Thomas Roth

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