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Teprenone

C
lead outcome
The look of firmness, tone and pores in…
grades vary by outcome ↓
Small molecule (non-peptide)
also called — Geranylgeranylacetone · GGA · Renovage · INCI: Teprenone
antioxidantskin conditioning (cosmetic)small molecule

This is an independent evidence reference. Vallydia does not currently sell a standalone teprenone product; this entry supports the antioxidant cluster and the outcome-substitution teaching set.

In brief

Teprenone is a real molecule with one honest, modest appearance study behind it — and one of the boldest unearned claims in the category bolted on top. It began as an anti-ulcer drug (geranylgeranylacetone / Selbex, Japan, 1984), was reformulated by Sederma as "Renovage" and sold on the word telomere. Graded C for the look of firmness and tone in mature skin — resting entirely on a single unblinded manufacturer trial of 24 volunteers — and F for the "lengthens your telomeres" headline, which rests on that same study, which never measured a telomere. A gentle, mildly antioxidant ingredient; not a cellular-renewal treatment.

Legal standing, by region
European Union
Permitted cosmetic ingredient (appearance claims only)

A permitted cosmetic ingredient in the EU under Regulation (EC) 1223/2009 for appearance claims. Telomere / DNA / cellular-renewal mechanism wording breaches the EU claims rules (Reg. 655/2013) and is not permitted.

United Kingdom
Permitted cosmetic ingredient (appearance claims only)

UK Cosmetics Regulation (retained EU law) tracks 1223/2009; appearance claims only, no mechanism claims.

United States
Cosmetic ingredient

A cosmetic ingredient in the US for appearance claims; mechanism / anti-ageing-at-DNA claims would be drug claims (FDA).

International
Separate medicinal use elsewhere

As geranylgeranylacetone it is a prescription anti-ulcer drug (Selbex) in Japan since 1984 — a separate medicinal category, not a cosmetic endorsement.

Evidence, by outcome
How we grade →

An honest grade per outcome — drawn from the evidence, not any catalogue. Hype and undemonstrated marketing claims grade low.

OutcomeEvidence base · effectGrade
The look of firmness, tone and pores in mature skin
Appearance-support only; single manufacturer trial, not independent evidence
The only evidence is a single manufacturer study (Sederma, ~24 volunteers, 3% teprenone): instrumental firmness up roughly 35%, tone up, pore size and redness down over six months. Plausible and consistent with an antioxidant, but one unblinded, in-house trial is thin ground for a lead grade. · May support the look of firmer, more even mature skin
C
Antioxidant / environmental-stress appearance
Appearance-support antioxidant, modest and lightly evidenced
Antioxidant and anti-inflammatory activity (heat-shock-protein biology) is documented for the molecule itself; the on-skin appearance benefit is modest and rests on limited data. · May support the look of skin against oxidative stress
C
"Reduces the look of dark spots"
Firewalled — not a demonstrated dark-spot treatment
One study reports melanin-synthesis inhibition in a lab model; there is no robust human appearance trial. The marketed "-56% spots" figure comes from the single in-house study. · Not a proven brightening active
D
"Lengthens telomeres / extends cell lifespan / renewal at the DNA level"
Firewalled — a mechanism claim with no measurement behind it
This is the headline claim and it is unearned. The only supporting study is the manufacturer's own, it did not measure telomere length, and no independent trial has shown a topical altering telomeres, telomerase, or cell lifespan in human skin. · Outside cosmetic scope — firewalled out
F
Disclosure

Vallydia sells its own cosmetic serums, and some ingredients graded here belong to the same categories as those products. Grades are drawn from the published evidence by the method we publish, and applied to our own ingredients on the same terms — our copper-peptide serum is graded no more kindly than the peptides it competes with. We disclose the interest so you can weigh it.

Trade names shown here (for example Matrixyl, Argireline, Syn-Ake) are the property of their respective owners and are used only to identify the ingredient under discussion. Their appearance implies no affiliation with, or endorsement by, the proprietor.

Evidence changes

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Cosmetic claims boundary
✓ Allowed (appearance / feel)
  • an antioxidant molecule that may support the look of firmer, more even mature skin
  • a mild antioxidant / soothing ingredient
✕ Not allowed (medicinal)
  • lengthens telomeres
  • extends cell lifespan
  • anti-ageing
  • treats

The medicinal-sounding science stays in the reference section; product copy speaks only to appearance/feel (Reg 655/2013). Different fields, never merged.

Identity

Teprenone (INCI; also geranylgeranylacetone, GGA; trademarked Renovage by Sederma) is a small acyclic terpenoid ketone. Before cosmetics it was — and still is — a prescription anti-ulcer drug in Japan. As a cosmetic it is sold on a telomere / "cellular anti-ageing" story that its evidence does not carry.

The molecule was a stomach drug first

Under the name Selbex, geranylgeranylacetone has been prescribed in Japan since 1984 for gastritis and stomach ulcers, working by coaxing cells to make heat-shock proteins — cellular first-responders that protect the stomach lining. Solid, unglamorous, real medicine. That is the raw material that was later carried out of the gut and onto the face.

Enter Sederma, and a very big word

Around 2007 the French cosmetic-ingredient house Sederma dissolved teprenone in a light carrier oil, trademarked it Renovage, and built the story around the most seductive word in ageing science: telomeres — the protective caps on chromosome ends that shorten as cells divide. A topical that "protects the telomeres of skin cells" sounds like it strikes at the root of ageing. It is a wonderful story. Look at what sits underneath it.

The single study, and the hole in the middle of it

The evidence for Renovage is essentially one clinical study, produced by the company selling the ingredient — about 24 volunteers, average age ~58, 3% teprenone. The instrument readings are the honest part: firmness up roughly 35%, tone up, pore size and redness down, pigmented spots reduced over six months. If that were the whole claim it would be an ordinary, defensible cosmetic result (its C).

But the study was built to support a telomere claim, and here is the hole: it did not measure telomere length. Nothing in it shows a telomere getting longer, or staying longer, in human skin, and no independent laboratory has since shown a topical teprenone altering telomeres, telomerase, or cell lifespan in living skin. The word doing all the marketing work is the one thing the trial never checked — a textbook, unusually ambitious outcome substitution, firewalled at F.

What teprenone can honestly be graded on

  • The look of firmness, tone and pores in mature skin — C. Plausible, but the whole case is one unblinded, manufacturer-run trial.
  • Antioxidant / environmental-defence appearance — C. Real antioxidant / heat-shock biology; modest, lightly-evidenced on-skin payoff.
  • The look of dark spots — D. A single lab finding plus one in-house "-56%" figure is not a proven brightening active.
  • "Lengthens telomeres / renewal at the DNA level" — F. The headline claim and the least supported thing about the ingredient.

The test you can reuse

Did any study actually measure the mechanism in the claim — or only how skin looked? If a serum promises telomere protection and the trial behind it measured firmness and pore size in the maker's own lab, the mechanism is decoration. The appearance change may be real and worth having; the biology in the headline is a story the study never tested. The wider pattern: outcome substitution · how we grade.

Development & history

  • An old anti-ulcer drug repositioned as "cellular anti-ageing" via a single supplier study.
  • Honest position: a real, tolerable, mildly antioxidant molecule with a modest single-study cosmetic case for the look of firmer mature skin — a companion to water-phase antioxidants like vitamin C and niacinamide, not a telomere treatment. Identifiers verified against PubChem (CID 5282199, CAS 6809-52-5); teprenone is an isomer mixture, so the structure shown is the representative isomer.
Chemical identifiers

Cross-reference identifiers for the authoritative external databases — not a recipe, and nothing about how to use it.

PubChem CID5282199
InChIKeyHUCXKZBETONXFO-NJFMWZAGSA-N
SMILESCC(=CCCC(=CCCC(=CCCC(=CCCC(=O)C)C)C)C)C

via PubChem name-match (teprenone → CID 5282199); CAS 6809-52-5 · high — teprenone is officially an isomer mixture of (5E,9E)/(5Z,9E) geranylgeranylacetone; CID 5282199 is the (5E,9E,13E) representative structure and CAS 6809-52-5 denotes the substance. confidence

Sources — 2 cited
01Sederma. Renovage (teprenone) technical monograph, data on file (2007). Manufacturer study, not peer-reviewed.
02Topical teprenone composition. European patent EP1879538B1.
Updated 2026-07-30

Grades reflect the published evidence, not our interest. No dosing, reconstitution, or administration is published for research compounds — that restraint is deliberate.

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This site provides neutral scientific reference and sells only products lawful in your region. Nothing here is medical advice, a recommendation, or an offer to supply unapproved medicines. No dosing or administration is published for research compounds. Cosmetic peptides per Regulation (EC) 1223/2009. Unapproved injectable peptides are neither sold nor advertised in the EU (Directive 2001/83/EC, Title VIII). © 2026 Vallydia.