Can l-ascorbic acid (LAA) loaded spanlastics improve LAA stability, skin permeation, and antioxidant protection against UVB-induced skin damage?
Topical delivery of l-ascorbic acid spanlastics, an animal study (Drug Deliv 2021, PMID 33620008) — a selected spanlastics formula (span 60 and tween 60 in a 5:1 ratio) achieved an EE% of 89.77% and a deformability of 11.13. The evidence comes from animals, not from people.
Source: Drug Deliv 2021, PMID 33620008 ↗ · Research map · How Magellan grades evidence · evidence confidence: medium
Drug Deliv · 2021 · PMID 33620008 · DOI 10.1080/10717544.2021.1886377
L-ascorbic acid delivered via spanlastic vesicles is more stable, penetrates skin better, and offers superior protection against UV-induced skin damage compared to a standard LAA solution.
The question
Can l-ascorbic acid (LAA) loaded spanlastics improve LAA stability, skin permeation, and antioxidant protection against UVB-induced skin damage?
What they tested
Entrapment of a high dose of vitamin C in spanlastic vesicles will provide maximum stability and efficacy for topical delivery, protecting skin from premature aging and UVB-induced damage.
How they did it
LAA-loaded spanlastics were prepared using the ethanol injection method. They were characterized for entrapment efficiency (EE%), particle size (PS), polydispersity index (PDI), zeta potential, deformability index (DI), and skin permeation. The stability of the selected spanlastic formula was assessed over 6 months. The efficacy of LAA spanlastics in treating UVB-induced damaged skin was evaluated in rats by measuring MMP2 and MMP9 levels via quantitative real-time PCR and Western blot, and through histopathological examination of rat skin.
What they found
A selected spanlastics formula (span 60 and tween 60 in a 5:1 ratio) achieved an EE% of 89.77% and a deformability of 11.13. This formula demonstrated good physical and chemical stability for 6 months. LAA spanlastics showed improved drug penetration into the stratum corneum compared to a topical LAA solution. In rats exposed to UV irradiation, LAA spanlastics significantly suppressed MMP2 and MMP9 levels by 30.4% and 65.3% respectively, compared to the control group. Histopathological studies confirmed that LAA-loaded spanlastics provided the highest skin protection, maintaining normal epidermal morphology and densely arranged dermal collagen fibers.
| MMP2 Suppression | 30.4 | |
|---|---|---|
| MMP9 Suppression | 65.3 |
LAA spanlastics significantly suppressed MMP2 and MMP9 levels in UVB-irradiated rats compared to the control group.
What it means
LAA-loaded spanlastics successfully improved LAA stability, enhanced skin permeation, and offered significant antioxidant protection against skin photodamage caused by UVB irradiation.
Limitations
The abstract does not explicitly state any limitations of the study.
Where the published abstract does not list limitations, we say so rather than inventing them. Read the full paper on PubMed before drawing conclusions.
The paper at a glance
| Title | Topical delivery of l-ascorbic acid spanlastics for stability enhancement and treatment of UVB induced damaged skin |
|---|---|
| Journal | Drug Deliv |
| Year | 2021 |
| PMID | 33620008 ↗ |
| DOI | 10.1080/10717544.2021.1886377 ↗ |
| Topic | Skin, hair & photoaging |
Read the source: PubMed record (authors, abstract, full citation) ↗ · Publisher via doi.org ↗
Where Magellan uses this paper
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Vitamin C (L-Ascorbic) Serum
In controlled studies, topically applied vitamin C has produced measurable improvements in photoaged skin, including reductions in fine lines and wrinkles, increased dermal collagen and elastic-tissue repair, and modest additional photoprotection when layered under sunscreen.
Vitamin C (L-ascorbic acid) is a water-soluble antioxidant found naturally in high concentrations in…
Research describes the compound or intervention studied. It is not a claim about any specific product.
Molecules & mechanisms in this paper
Each of these is named in the paper’s own words above. Open the monograph for the full mechanism and its other citations.
Cite this page
These citations point at this summary. To cite the original paper with its full author list, use the PubMed record or doi.org.
Magellan Longevity. (2026). Can l-ascorbic acid (LAA) loaded spanlastics improve LAA stability, skin permeation, and antioxidant protection against UVB-induced skin damage? [Plain-English summary of Drug Deliv 2021, PMID 33620008, DOI 10.1080/10717544.2021.1886377]. Magellan Longevity. https://magellanlongevity.com/study/d33620008.html@misc{magellan_d33620008,
title = {Can l-ascorbic acid (LAA) loaded spanlastics improve LAA stability, skin permeation, and antioxidant protection against UVB-induced skin damage?},
author = {{Magellan Longevity}},
year = {2026},
howpublished = {\url{https://magellanlongevity.com/study/d33620008.html}},
note = {Plain-English summary of PubMed PMID 33620008; DOI 10.1080/10717544.2021.1886377; Drug Deliv 2021. Reviewed by Gabriel Radu, DO},
urldate = {2026-08-11}
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