Ingredient guide
Ectoin (THP)
INCI name · tetrahydromethylpyrimidine carboxylic acid
In short
Ectoin is a protective molecule from extremophile bacteria that helps skin retain moisture and stay comfortable under environmental stress. It’s known for its strong hydration and barrier‑supportive qualities.
What it is
Alternative INCI name for ectoin. The clinical evidence comes from short studies of complete ectoin-containing creams, including one active-comparator trial and one 1% ectoin plus 0.1% hyaluronic acid vehicle-controlled trial; it does not prove this named form or every formula performs independently.
Evidence receipt
ModerateEctoin · applied to skin
Based on 3 sources
Open the citable recordShort clinical studies of ectoin-containing creams reported improved eczema severity scores; the vehicle-controlled trial used ectoin together with hyaluronic acid.
Studied as Ectoin: ectoin-containing cream EHK02-01, nonsteroidal anti-inflammatory reference cream, 1% ectoine with 0.1% hyaluronic acid cream, vehicle cream, 5.5–7% ectoin-containing topical formulations.
Studies were small and short. One used an active comparator rather than a plain vehicle, one tested ectoin with hyaluronic acid, and the systematic review had an industry-employed author. They do not prove every ectoin product works the same way.
See 3 sources
Randomized intra-individual double-blind multicentre trial in 65 adults with mild-to-moderate atopic dermatitis: after 28 days, the ectoin-containing cream performed equivalently to an active nonsteroidal reference cream. There was no plain-vehicle arm.
local eczema severity, investigator assessment, itch · ectoin-containing cream EHK02-01, nonsteroidal anti-inflammatory reference cream
Skin Pharmacol Physiol, 2014Randomized observer-blind vehicle-controlled four-week trial in children aged 2–18: 70 were randomized and 57 analysed; the combination cream improved objective SCORAD versus vehicle (P < .001), but ectoin was not tested alone. Mild cutaneous adverse events occurred in 23.5% versus 5.7%.
objective SCORAD, investigator assessment, itch, cutaneous adverse events · 1% ectoine with 0.1% hyaluronic acid cream, vehicle cream
Pediatr Dermatol, 2023Systematic review of six clinical studies (five in atopic dermatitis, one in retinoid dermatitis): outcomes generally favoured ectoin-containing formulations, but many studies were open-label, adjunctive or low-certainty and one author was employed by Bitop AG.
skin dryness, itch, dermatitis severity · 5.5–7% ectoin-containing topical formulations
Dermatol Ther (Heidelb), 2022
Affiliation note. Publication links report the study authors and their affiliations. MIRU does not infer independence from an affiliation alone.
Where it sits
A watery layer. After cleansing, before anything heavier, ideally on slightly damp skin.
- Cleanse
- Tone
- Ectoin
- Moisturise
- SPF
Also found as
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Common questions
What does Ectoin do for skin?
It helps improve hydration levels and makes the skin feel more resilient in the face of dryness or sun exposure. Its protective action supports a smoother surface.
Who is Ectoin suitable for?
It works well for dry and sensitive skin, and for anyone seeking long‑lasting hydration.
How is Ectoin used in skincare?
It appears in serums, day creams, and sunscreens designed to keep skin hydrated and comfortable.
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Personal guidance, not medical advice.