← Intelligence Vault
ingredientsSystematic Review1 min read
Vitamin C in dermatology: mechanisms of action and clinical applications
Authors · Pullar JM, Carr AC, Vissers MCM
Journal · Nutrients · July 2022
What this means for you
The plain-language read
Clinical studies demonstrate L-ascorbic acid at 15-20% concentrations significantly reduces hyperpigmentation through inhibition of tyrosinase.
Key findings
- L-ascorbic acid at 15-20% significantly reduces hyperpigmentation
- Essential cofactor for collagen synthesis
- Vitamin C + Vitamin E = 4x synergistic photoprotection
- Most effective in AM routine before SPF application
Practical note
Use 15-20% L-ascorbic acid in the morning before SPF. Store in dark bottle — oxidizes in light. Pairs synergistically with Vitamin E and ferulic acid for enhanced stability and efficacy.
Translate to action
What this means for your routine
vitamin_cAM/PM routine15–20%
If you're targeting hyperpigmentation, this research supports adding vitamin_c to your AM/PM routine. Effective concentration range: 15–20% based on this study.
Translated from this study's findings, not a personal prescription. Pair with your existing protocol and your practitioner's guidance.
Technical Summary, For Professional Reference
Clinical context
Vitamin C (ascorbic acid) plays crucial roles in skin health through multiple mechanisms. As the most abundant antioxidant in skin, it protects against photooxidative damage. It is an essential cofactor for collagen synthesis, with deficiency directly impairing wound healing.
Ingredients discussed
Full abstract→
Vitamin C (ascorbic acid) plays crucial roles in skin health through multiple mechanisms. As the most abundant antioxidant in skin, it protects against photooxidative damage. It is an essential cofactor for collagen synthesis, with deficiency directly impairing wound healing. Clinical studies demonstrate L-ascorbic acid at 15-20% concentrations significantly reduces hyperpigmentation through inhibition of tyrosinase. Combination with vitamin E provides synergistic photoprotection 4x greater than either alone.
Original source →Related research
ingredientsSystematic Review
Does Astragalus mongholicus Bunge help promote the healing of wounds? A systematic review and meta-analysis of preclinical animal studies.
Front Pharmacol · Jan 2026
Wounds continue to represent a significant public health challenge globally. In recent years, Astragalus mongholicus Bunge, a traditional Chinese botanical drug utilized for wound treatment, has garnered increasing research attention. However, the therapeutic efficacy and safety of this natural botanical drug on wound healing remain poorly understood.
phacollagensystematic_review
Read →regulationOpinion
Multitargeted Modulation of Skin Dullness by HNHT Formulation: Synergistic Inhibition of Melanogenesis, Glycation, and Lipofuscin Deposition.
J Cosmet Dermatol · May 2026
Skin dullness, characterized by pigmentation disorders and yellowing, is a major cosmetic concern in Asian populations. Lipofuscin exhibits ultraviolet (UV)/visible light spectral absorption, reduces skin reflectance, and contributes to dullness, whereas existing therapies targeting melanogenesis and glycation lack comprehensive efficacy. This study aimed to evaluate the multimodal anti-dullness effects of a novel formulation (HNHT: hyaluronic acid, niacinamide, hydrolyzed red algae, and tranexamic acid).
niacinamidehyaluronic_acidtranexamic_acid
Read →ingredientsSystematic Review
L-Carnitine in Dermatology: A Systematic Review of Therapeutic Potential and Biomarker Applications.
J Cutan Med Surg · Mar 2026
L-Carnitine, an amino acid derivative critical for fatty acid metabolism, exhibits anti-inflammatory, antioxidant, and cytoprotective properties, with emerging applications in dermatology. This review explores its therapeutic potential, both topically and systemically, and its role as a biomarker in various skin disorders. A systematic search of Medline, EMBASE, and PubMed (1946-January 2025) was conducted, focusing on L-carnitine and dermatologic conditions, excluding acetyltransferases, acyltransferases, breast, and genetic metabolic diseases.
retinolsalicylic_acidacne
Read →