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3d ago

Two Kiwifruit a Day Raised Skin Vitamin C and Thickened Skin in Small Trial

Researchers say the findings are preliminary, with improvements limited to specific skin measures.

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Vitamin C (ascorbate) is found in all skin compartments. Pullar et al. carried out a comprehensive investigation to establish the relationship between plasma and skin ascorbate levels, with a focus on the major skin compartments. Image credit: Pullar et al., doi: 10.1016/j.jid.2025.10.587.

Overview

  • In an eight-week, two-site study of 24 healthy adults in New Zealand and Germany, daily intake of two golden kiwifruit increased vitamin C in blood and across skin layers.
  • Measured ascorbate levels rose proportionally in whole skin, dermis and epidermis, consistent with active uptake via sodium-dependent vitamin C transporters.
  • Participants showed higher skin density and faster epidermal cell renewal, outcomes linked to collagen-rich dermal structure and surface-layer regeneration.
  • Other functional measures did not improve, including UVA-related protection and procollagen I peptides, and skin elasticity declined slightly by about 7%.
  • The peer-reviewed study in the Journal of Investigative Dermatology supports maintaining roughly 250 mg of dietary vitamin C per day, noting dietary intake as a practical route versus topical products.