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Medik8

Liquid Peptides

$68·30 ml·~$41/mo to use

Reviewed by SerumTruth Editorial · Updated July 2026

A polished, comfortable peptide serum from a serious brand, but the evidence and the pricing do not line up. The headline peptides carry limited support, the doses are undisclosed, and you pay a lot for the count on the label. Pleasant to use, hard to justify over cheaper multi-peptide options.

SerumProof score60 / 100
  • Evidence14 / 30

    Strength of the research behind the key actives

    • Argireline: limited evidence
    • Matrixyl Synthe'6: limited evidence
    • Score is the average of the key actives’ evidence grades.
  • Potency20 / 25

    Dosed at studied levels, not fairy-dusted

    • Argireline: present, but below a studied dose
    • Matrixyl Synthe'6: dosed at a studied level
    • Potency tracks how strongly the actives are dosed, led by the strongest, not how many there are.
  • Delivery & stability16 / 20

    Delivery tech + packaging that protects fragile actives

    • Delivery: standard
    • Packaging: airless, opaque
    • No fragile actives here, so packaging barely moves the score.
  • Formulation3 / 10

    Disclosure, active breadth, and ingredient generation

    • 0 of 2 actives disclose a concentration
    • 2 key actives (breadth credit caps at 3)
    • Current-generation or synergistic: Matrixyl Synthe'6
  • Value7 / 15

    What a month of use costs vs. the category

    • About $41 per month to use
    • $68 for 30 ml, used about twice a day (about 0.3 ml each time), so a bottle lasts about 1.7 months
    • Band: $6/month or less earns full marks, $60/month or more hits the floor.

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Where to buy at Dermstore

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What’s inside

ActiveDisclosedDose
Argirelinen/aLight
Matrixyl Synthe'6n/aStudied

A concentrated blend of ten peptides, Acetyl Hexapeptide-8 and Matrixyl-family messengers among them, in an opaque tube. It is fragrance-free and pleasant to layer, but none of the individual peptide levels are disclosed, and several are the trendier expression-line peptides whose evidence is limited. The tube is fine for peptides, which are not especially fragile.

How it’s delivered

DeliveryStandardPackagingAirless, opaque

Air- and light-sensitive actives (vitamin C, copper peptides) lose potency fast in the wrong packaging, so delivery and the bottle are scored, not just what’s on the label.

The actives, explained

Cosmetic information for general education, not medical advice. The SerumProof score reflects our reading of publicly available research and formulation disclosures. See how scoring works.