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Vtc6.0

Vitamin C (topisch) – Forschung

Überwiegend Mechanismus / Beobachtung

7 begutachtete Studien

Was die Evidenz sagt

Überwiegend Mechanismus / Beobachtung

Die meisten Studien zu Vitamin C (topisch) sind mechanistisch oder beobachtend statt RCTs, die einen klinischen Effekt messen — betrachte die Ergebnisse als vorläufig.

Die meiste Evidenz stammt aus gemischt-qualitativen randomisierten Studien, veröffentlicht 1999–2023 mit einer typischen Studiengröße von 20 Teilnehmenden.

Basierend auf 7 Studien · 3 RCTs · 39 Teilnehmende insgesamt

Konfidenz

Mittlere Konfidenz

Nach Outcome

Skin healthModerate Verbesserung feiner Linien und der Textur lichtgeschädigter Haut (kosmetisch) · 8-24 weeks · Antioxidative Unterstützung und verbesserte Strahlkraft/Ebenmäßigkeit; am besten als Ergänzung zu täglichem Sonnenschutz (kosmetisch) · 4-12 weeks
Überwiegend Mechanismus / Beobachtung3 Studien
Skin tone & pigmentationModerate Aufhellung und Reduktion des Erscheinungsbildes von Hyperpigmentierung/Melasma (kosmetisch, kein gesundheitliches Ergebnis) · 8-12 weeks
Zu wenige bewertete Studien2 Studien

Stetige Forschung

2 Studien in den letzten 5 Jahren

199920112023

1RCTn=19 · very small study1999

A 3-month daily regimen of topical ascorbic acid provided objective and subjective improvement in photodamaged facial skin.

Traikovich SS. · Arch Otolaryngol Head Neck Surg (1999)

Split-face, randomized, double-blind, vehicle-controlled trial: active L-ascorbic acid serum vs vehicle daily for 3 months in mild-to-moderate facial photodamage
Optical profilometry showed a statistically significant 73.7% greater improvement in surface roughness with active vs vehicle
Clinical scoring significantly favored active for fine wrinkling, tactile roughness, coarse rhytids, laxity/tone, and sallowness

Quelle ansehen

2RCT2003

Topical application of 5% vitamin C cream was an effective and well-tolerated treatment.

Humbert PG, Haftek M, Creidi P, Lapière C, Nusgens B, Richard A, Schmitt D, Rougier A, Zahouani H. · Exp Dermatol (2003)

6-month double-blind randomized trial comparing 5% vitamin C cream vs its excipient on photoaged skin of the low-neck and arms
Significant improvement in the global score on the vitamin C side, with increased skin microrelief density and decreased deep furrows
Biopsies gave ultrastructural evidence of elastic-tissue repair, corroborating the clinical and skin-surface findings

Quelle ansehen

3Systematische Übersicht2023

Vitamin C is effective in treating uneven, wrinkled skin and has depigmenting properties, but long-term use may be needed to achieve noticeable changes.

Correia G, Magina S. · J Cosmet Dermatol (2023)

Systematic review of prospective RCTs of topical vitamin C in melasma or photodamage: 7 publications, 139 total volunteers
Topographic and biopsy data indicated smoother, less-wrinkled skin, and objective pigmentation assessments showed significant lightening
Concludes vitamin C may suit melasma and photoaging but more studies are needed to confirm results and define the ideal concentration

Quelle ansehen

4Systematische Übersicht2023

All the studies used vitamin C in combination with other ingredients or therapeutic mechanisms, thereby complicating any specific conclusions regarding the efficacy of vitamin C.

Sanabria B, Berger LE, Mohd H, Benoit L, Truong TM, Michniak-Kohn BB, Rao BK. · J Drugs Dermatol (2023)

PRISMA systematic review (2015-2022) of topical vitamin C for wrinkles: 5,428 records reduced to 7 articles, 4 at Level IB evidence
Every included study combined vitamin C with other ingredients or therapies, so vitamin-C-alone efficacy for wrinkles could not be isolated
Concludes further high-quality, prospective, comparative studies are needed — the key counter-evidence on this page

Quelle ansehen

5RCTn=20 · very small study2010

After 12 weeks of treatment with iontophoresis, both multivitamin and vitamin C were effective for melasma.

Choi YK, Rho YK, Yoo KH, Lim YY, Li K, Kim BJ, Seo SJ, Kim MN, Hong CK, Kim DS. · Int J Dermatol (2010)

Split-face clinical arm: 20 melasma patients received iontophoresis of vitamin C or multivitamin; both improved melasma by colorimetry after 12 weeks
In vitro, vitamin C inhibited melanogenesis with low cytotoxicity and led on tyrosinase inhibition and antioxidation
However, multivitamin reduced melanin content more than vitamin C, and delivery was iontophoresis rather than plain topical application

Quelle ansehen

6Tierstudie2003

The combination of 15% L-ascorbic acid and 1% alpha-tocopherol provided significant protection against erythema and sunburn cell formation.

Lin JY, Selim MA, Shea CR, Grichnik JM, Omar MM, Monteiro-Riviere NA, Pinnell SR. · J Am Acad Dermatol (2003)

Pig-skin model: 15% L-ascorbic acid + 1% alpha-tocopherol applied daily for 4 days, then UV-irradiated
Vitamin C alone was photoprotective, but the C+E combination was superior (a 4-fold antioxidant protection factor) and protected against thymine-dimer formation
Combination and animal study (not human, not vitamin-C-alone) — supports an antioxidant/photoprotective role as an adjunct

Quelle ansehen

7In vitro2009

Vitamin C is an important water-soluble free radical scavenger and an essential cofactor for collagen synthesis by dermal fibroblasts.

Duarte TL, Cooke MS, Jones GD. · Free Radic Biol Med (2009)

Microarray analysis of primary human dermal fibroblasts exposed to a stable vitamin C derivative vs vitamin-C-deprived cells
Vitamin C upregulated DNA replication/repair and cell-cycle genes and increased fibroblast proliferation, migration, and DNA-damage repair
Establishes vitamin C's dual mechanistic role in skin: collagen-synthesis cofactor plus free-radical scavenging/DNA protection

Quelle ansehen

In der Forschungsbibliothek ansehen

Vitamin C (topisch) – Forschung

Überwiegend Mechanismus / Beobachtung

Use of topical ascorbic acid and its effects on photodamaged skin topography.

Topical ascorbic acid on photoaged skin. Clinical, topographical and ultrastructural evaluation: double-blind study vs. placebo.

Efficacy of topical vitamin C in melasma and photoaging: A systematic review.

Clinical Efficacy of Topical Vitamin C on the Appearance of Wrinkles: A Systematic Literature Review.

Effects of vitamin C vs. multivitamin on melanogenesis: comparative study in vitro and in vivo.

UV photoprotection by combination topical antioxidants vitamin C and vitamin E.

Gene expression profiling reveals new protective roles for vitamin C in human skin cells.