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SAVE €6 — €21 INSTEAD OF €27 AS SAMPLES

4.7 · 274 verified reviews

27,000+ customers across Europe

Glow Trio: 5ml Serum Samples For Every Skin Need

Try all three klarskin serums. Without the commitment.

5 ml trial sizes of MasterCell, GlowScreen + RetinGold — €21.

All 3 serums AM + PM samples 2–3 weeks per sample No commitment
  • All three serums — 5 ml each · 2–3 weeks of real testing
  • €21 total — save €6 vs buying samples individually
  • Zero commitment — test, decide, order the full size of whichever one works

€0

One tin = your complete 28-day reset (30 daily doses)

Try the full klarskin serum routine before committing to full sizes.

Free shipping on orders over €100

  • 30-Day Money-Back Guarantee
  • 2–3 weeks of real use per sample
  • Made in Germany
  • Vegan & Cruelty-Free
What's in the Glow Trio

5 ml trial sizes of all three klarskin serums — enough for 2–3 weeks of real use so you can find the one your skin loves.

MasterCell Day Serum (5 ml) — Highly-concentrated niacinamide + plant stem cells. Test as your AM base serum.

GlowScreen SPF50+ Oil (5 ml) — Lightweight SPF50+ oil. Test as your AM last step.

RetinGold Night Serum (5 ml) — Gold-bound retinol + azelaic acid. Test as your evening correction.

Bought separately as samples: €27 (€9 each). Glow Trio: €21 — save €6.

How to Test the Glow Trio

The trick: test one product at a time so you know which one actually works for your skin.

  1. Week 1: Start with MasterCell AM as your base. Note how your skin responds.
  2. Week 2: Add GlowScreen as your last AM step. See how it layers + wears.
  3. Week 3: Introduce RetinGold 2–3 evenings per week. Watch for texture changes.

After 3 weeks you'll know which one (or all three) deserves a spot in your routine — and you can order full sizes individually or as a bundle.

Shipping & Returns

Free shipping on EU orders over €100. Standard delivery 3–5 business days. International shipping available.

30-day money-back guarantee — if the Glow Trio doesn't help you find your fit, email us within 30 days for a full refund. No questions asked.

WHAT'S IN THE TRIO

Three trial sizes.Enough to actually decide.

Most sample sizes give you one application. The Glow Trio gives you 2–3 weeks of real use per product — long enough for your skin to tell you what's working.

MasterCell Day Serum — 5 mlAM · DAY SERUM

MasterCell Day Serum — 5 ml

Test it as your AM base.

  • Highly-concentrated niacinamide
  • Plant stem cells for cell renewal
  • 2–3 weeks of real testing in 5 ml
  • Full size €46 if you love it

5 ml trial · €9 if bought as sample

See full-size details
GlowScreen SPF50+ — 5 mlAM · SPF50+

GlowScreen SPF50+ — 5 ml

Test it as your AM last step.

  • Broad-spectrum UVA + UVB
  • No white cast · perfect under makeup
  • 2–3 weeks of real testing in 5 ml
  • Full size €44 if you love it

5 ml trial · €9 if bought as sample

See full-size details
RetinGold Night Serum — 5 mlPM · OVERNIGHT

RetinGold Night Serum — 5 ml

Test it as your evening correction.

  • Gold-bound retinol delivery
  • 5 % azelaic acid for blemishes
  • 2–3 weeks of real testing in 5 ml
  • Full size €48 if you love it

5 ml trial · €9 if bought as sample

See full-size details

REAL RESULTS

27,000+ women trust klarskin.Including the ones who tried before they bought.

27,000+
Happy customers
★ 4.8–4.9
Across all 3 serums
€6
Saved vs samples bought individually

FREQUENTLY ASKED

Questions, answered.

How much do I save vs buying samples individually?

€6. Bought separately, the three 5 ml samples cost €9 each = €27. The Glow Trio packages all three for €21 — about 22 % off the per-sample price.

Can I order it alone, or only with another product?

You can order it on its own. Pair it with Radiance Powder or any of our serums if you want — but the Trio works as a standalone trial too. Free shipping kicks in at €100 cart value.

How long do the 5 ml samples actually last?

About 2–3 weeks per product at the recommended use (2–3 drops per application). Long enough for your skin to give a real verdict — not just a “first impression.”

Should I use all three at the same time?

We recommend introducing one per week so you know which one is doing what. Start with MasterCell, then add GlowScreen, then RetinGold. Your skin tells you what's working when only one variable changes at a time.

What if my skin reacts to one of them?

Stop using that one and pause for a few days. If you're not sure what's happening, message us on WhatsApp or email — Antoneta or the team will help you sort it out.

What if I want a refund on the Trio?

30-day money-back guarantee applies — if the Trio doesn't help you decide which serum is right for you, email us within 30 days for a full refund. No questions asked.

Why is RetinGold a “PM only” sample?

RetinGold contains retinol, which makes your skin more photosensitive. Always use it in the evening, and always pair with SPF the next morning. The other two are AM serums.

After the trial, where do I go next?

Order the full size of the serum (or serums) that worked best — or pick the bundle that pairs them with Radiance Powder. Most people end up with the Complete Radiance Collection after testing the Trio.

See all FAQs

READY TO ORDER A FULL SIZE?

Liked what you tried?Order the full system.

Add the full-size serum that worked best — or jump to a bundle that pairs it with Radiance Powder. The Complete Radiance Collection saves you €38 on all four products + a Wellness Journal.

Configure a routine collection or add products via the Customizer.