Ingredient intelligence
Retinol
Retinoid · Retinol · C20H30O
Retinol is a vitamin A alcohol that cells can convert to retinaldehyde and then retinoic acid, the form that binds nuclear retinoic acid and changes .
Any underlined term can be tapped for an everyday-English translation.
Molecular identity
- Formula
- C20H30O
- Molecular weight
- 286.5 g/mol
- PubChem CID
- 445354
- ChEBI
- CHEBI:17336
Biological targets
Retinoic acid receptor alpha (RARA)
high confidenceactivates · receptor
Activated by the retinoic acid rather than retinol itself.
UniProt P10276Retinoic acid receptor gamma (RARG)
high confidenceactivates · receptor
UniProt P13631Retinol dehydrogenase (RDH12)
medium confidencetargets · enzyme
UniProt Q96NR8Cellular retinol-binding protein 1 (RBP1)
medium confidencetargets · transporter
UniProt P09455
How could this ingredient interact with biology?
Biological network
Ingredient → molecule → target → gene/protein → pathway → process → studied outcome. Relationship strength is drawn from the curated confidence tier; nothing is added to make the chain look complete.
drag to pan · hover to isolate a path · click a node for detail
Text alternative for this network
- Retinol is molecule Retinol — high confidence
- Retinol is molecule Retinaldehyde — high confidence
- Retinol is molecule All-trans retinoic acid — high confidence
- Retinol activates Retinoic acid receptor alpha (RARA) — high confidence
- Retinol activates Retinoic acid receptor gamma (RARG) — high confidence
- Retinol targets Retinol dehydrogenase (RDH12) — medium confidence
- Retinol targets Cellular retinol-binding protein 1 (RBP1) — medium confidence
- Retinoic acid receptor alpha (RARA) encoded by RARA — high confidence
- Retinoic acid receptor gamma (RARG) encoded by RARG — high confidence
- RARA participates in Retinoid metabolism and transport — high confidence
- RARG participates in Retinoid metabolism and transport — high confidence
- COL1A1 participates in Retinoid metabolism and transport — medium confidence
- MMP1 participates in Retinoid metabolism and transport — medium confidence
- RARA participates in Nuclear receptor transcription pathway — high confidence
- RARG participates in Nuclear receptor transcription pathway — high confidence
- COL1A1 participates in Nuclear receptor transcription pathway — medium confidence
- MMP1 participates in Nuclear receptor transcription pathway — medium confidence
- RARA participates in Extracellular matrix organisation — medium confidence
- RARG participates in Extracellular matrix organisation — medium confidence
- COL1A1 participates in Extracellular matrix organisation — medium confidence
- MMP1 participates in Extracellular matrix organisation — medium confidence
- Retinoid metabolism and transport associated with Keratinocyte proliferation — high confidence
- Nuclear receptor transcription pathway associated with Keratinocyte proliferation — high confidence
- Extracellular matrix organisation associated with Keratinocyte proliferation — medium confidence
- Retinoid metabolism and transport associated with Collagen biosynthesis — medium confidence
- Nuclear receptor transcription pathway associated with Collagen biosynthesis — medium confidence
- Extracellular matrix organisation associated with Collagen biosynthesis — medium confidence
- Retinoid metabolism and transport associated with Epidermal cell turnover — high confidence
- Nuclear receptor transcription pathway associated with Epidermal cell turnover — high confidence
- Extracellular matrix organisation associated with Epidermal cell turnover — medium confidence
- Keratinocyte proliferation studied in Studied for photoaging-related skin texture and wrinkling — medium confidence
- Collagen biosynthesis studied in Studied for photoaging-related skin texture and wrinkling — medium confidence
- Epidermal cell turnover studied in Studied for photoaging-related skin texture and wrinkling — medium confidence
- Keratinocyte proliferation studied in Studied for epidermal renewal — medium confidence
- Collagen biosynthesis studied in Studied for epidermal renewal — medium confidence
- Epidermal cell turnover studied in Studied for epidermal renewal — medium confidence
- Keratinocyte proliferation studied in Irritation and photosensitivity are commonly reported in studies — medium confidence
- Collagen biosynthesis studied in Irritation and photosensitivity are commonly reported in studies — medium confidence
- Epidermal cell turnover studied in Irritation and photosensitivity are commonly reported in studies — medium confidence
Biological pathways
Retinoid metabolism and transport
high confidenceConversion and carrier-protein handling of retinol and its .
Reactome R-HSA-975634
Nuclear receptor transcription pathway
high confidence/RXR heterodimers bind retinoic acid response elements and alter .
Reactome R-HSA-383280
Extracellular matrix organisation
medium confidenceand matrix-metalloproteinase changes reported in retinoid-treated skin.
Reactome R-HSA-1474244
Evidence engine
Strong
Multiple independent human studies point in the same direction.
Skinceptor Evidence Index
75
experimental · of 100
This index is a research-navigation aid describing how much evidence exists and how it was produced. It is not a medical safety score, an efficacy guarantee, or a clinical recommendation.
Study composition
- Human1
- Randomised controlled trial2
- In-vitro1
- Review2
- Total studies
- 6
- Human studies
- 3
- Largest sample
- 44
- Range
- 1999–2019
Index breakdown
- Study design quality61% × 28%
Mean design weight across curated studies (meta-analysis 1.0, RCT 0.9, other human 0.7, review 0.45, animal 0.35, in-vitro 0.25).
- Human evidence share100% × 22%
Proportion of curated evidence measured in people rather than cells or animals.
- Evidence volume89% × 14%
Log-scaled count of curated studies, so volume alone cannot dominate the score.
- Largest sample size55% × 12%
Log-scaled largest reported sample size across curated human studies.
- Replication100% × 12%
Independent human studies, capped at three; one study is never treated as replicated.
- Recency65% × 7%
Linear decay over a twenty-year window from the most recent curated publication.
- Source traceability17% × 5%
Share of curated studies with a verified PMID or DOI in this dataset.
Insufficient comparable evidence for quantitative synthesis.
Research timeline
How the evidence accumulated
1999
Retinaldehyde: cutaneous conversion to retinoic acid and tolerability in human skin
Reviewsample size unavailable · Dermatology (review)
2000
Retinoid-induced procollagen synthesis and matrix metalloproteinase suppression in human skin in vivo
Humann = 22 · Journal of Clinical Investigation
2007
Retinol improves the appearance of naturally aged skin
Randomised controlled trialn = 36 · Archives of Dermatology
2015
Retinoic acid receptor expression and retinoid signalling in human skin
Reviewsample size unavailable · Journal of Investigative Dermatology (review)
2018
Hydroxypinacolone retinoate: receptor binding without prior conversion
In-vitrosample size unavailable · International Journal of Cosmetic Science
2019
Prospective randomized double-blind assessment of topical bakuchiol and retinol for facial photoaging
Randomised controlled trialn = 44 · British Journal of Dermatology
Ingredient fingerprint
21 nodes · 41 relationships · seed "retinol"
The fingerprint is a deterministic visual signature: ridge amplitude comes from the number of entities in each tier, node placement from identifier hashes, and opacity from confidence. Two ingredients can never produce the same figure unless their networks are identical.
Open in Biology as Art →Research
6 curated studies
Prospective randomized double-blind assessment of topical bakuchiol and retinol for facial photoaging
Reported comparable improvement in wrinkle and pigmentation scores between bakuchiol and retinol, with less scaling and stinging reported for bakuchiol.
Limitations — Single centre, 12 weeks, no vehicle arm, so both may reflect regression to the mean.
Hydroxypinacolone retinoate: receptor binding without prior conversion
Reported direct retinoic acid receptor binding for the ester, in contrast to retinol which requires cutaneous conversion.
Limitations — Binding assays only; no controlled human comparison against retinol; identifier not verified during curation.
Retinoic acid receptor expression and retinoid signalling in human skin
Summarises RAR/RXR heterodimer signalling as the transcriptional mechanism of retinoid action in epidermis and dermis.
Limitations — Narrative review; mechanistic focus without effect-size synthesis.
Retinol improves the appearance of naturally aged skin
Reported improvement in fine wrinkling with topical retinol versus vehicle in older adults.
Limitations — Small sample; older cohort limits generalisation; identifier not verified during curation.
Retinoid-induced procollagen synthesis and matrix metalloproteinase suppression in human skin in vivo
Reported increased procollagen I expression and reduced MMP-1 in biopsied retinoid-treated skin.
Limitations — Biopsy-based surrogate endpoints; identifier not verified during curation.
Retinaldehyde: cutaneous conversion to retinoic acid and tolerability in human skin
Summarises evidence that retinaldehyde is oxidised in skin to retinoic acid, with reported tolerability intermediate between retinol and tretinoin.
Limitations — Narrative review; identifier not verified during curation.
Community evidence
Submitted by readers
Reader submissions appear here only after review. They are not part of the curated dataset and do not affect the Skinceptor Evidence Index.
No approved community submissions yet.
Sources
- PubChem 445354Verified 2026-09-14
- UniProt P10276Verified 2026-09-14
- Reactome R-HSA-975634Verified 2026-09-14
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