Facial Treatment Essence
Reviewed by SerumTruth Editorial · Price and formula checked July 2026
The essence that built a cult, and a pleasant fermented hydrator, but the evidence is limited and mostly brand-led while the price is extraordinary for a single-ingredient story. You are paying for the name and the ritual far more than for proven actives.
- Every active discloses its concentration
- Key actives carry only limited or preliminary evidence
- Costly to use, about $121 a month
- Evidence14 / 30
Strength of the research behind the key actives
- Galactomyces Ferment Filtrate (Pitera): limited evidence
The average of the key actives’ evidence grades.
- Potency21 / 25
Dosed at studied levels, not fairy-dusted
- Galactomyces Ferment Filtrate (Pitera) (>90%): dosed at a studied level
How strongly the actives are dosed, led by the strongest, not how many there are.
- Delivery & stability14 / 20
Delivery tech + packaging that protects fragile actives
- Delivery: standard
- Packaging: clear dropper
- No fragile actives here, so packaging barely moves the score.
Delivery tech plus packaging, and packaging only counts when actives are fragile.
- Formulation6 / 10
Disclosure, active breadth, and ingredient generation
- 1 of 1 actives disclose a concentration
- 1 key active (breadth credit caps at 3)
- No current-generation or synergy bonus
Disclosure, active breadth, and current-generation or synergistic actives.
- Value3 / 15
What a month of use costs vs. the category
- About $121 per month to use
- $185 for 160 ml, used about twice a day (about 1.75 ml each time), so a bottle lasts about 1.5 months
What a month of use costs: full marks at $6 a month or less, the floor at $60 a month or more.
Tap any row to see how its score was built.
Ranks #80 of 84 hydration & barrier serums we have scored.
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What’s inside
| Active | Disclosed | Dose |
|---|---|---|
| Galactomyces Ferment Filtrate (Pitera) | >90% | Studied |
A famous single-ferment essence built on over 90% galactomyces ferment filtrate, branded as Pitera, in a clear glass bottle you shake into your hands. It is a hydrating, conditioning first-step layer aimed at the appearance of a smoother, brighter-looking complexion. It is essentially one ferment blend plus preservation, so there is little else on the label.
How it’s delivered
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
What the research says
In a small trial, a serum with this ferment filtrate plus other actives was linked to a better look of lingering dark spots after 8 weeks.
The Effectiveness of Galactomyces Ferment Filtrate, Dexpanthenol, and Centella Asiatica Combination Serum in the Treatment of Post-Acne Hyperpigmentation in Subjects with Skin of Color. Skinmed, 2021. PubMed ↗
A study of the active, not this exact product. What matters for the score is whether this serum uses it at a comparable dose.
Higher-scoring alternatives
Same category, better SerumProof score. Worth a look before you buy.
Revision history
- July 11, 2026Price and formula rechecked
- July 10, 2026Review published
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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.