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Research prooves eating vitamin C-rich fruits daily linked to thicker skin and faster cell regeneration

Eating vitamin C-rich foods may do more than improve skin glow — it may actually alter the skin’s structure, according to new research that shows a direct link between diet, collagen production and skin renewal.

Scientists at the University of Otago’s Faculty of Medicine in Christchurch Otautahi have found that skin health responds measurably to dietary vitamin C, not just topical creams and serums. The study shows that vitamin C consumed through food travels via the bloodstream into every layer of the skin, supporting collagen formation and faster cell renewal.

Published in the Journal of Investigative Dermatology, the research found that vitamin C levels in the skin closely mirror levels in the blood, known as plasma. When dietary intake increases, concentrations rise simultaneously in both blood and skin.

The study followed 24 healthy adults in Aotearoa New Zealand and Germany. Participants who raised their vitamin C intake by eating two vitamin C-rich SunGold kiwifruit each day showed a clear increase in vitamin C levels within their skin. This rise was associated with thicker skin — an indicator of improved collagen production — and greater renewal of the outer skin layer. 

Lead author Professor Margreet Vissers from Matai Haora — the Centre for Redox Biology and Medicine within the Department of Pathology and Molecular Medicine — described the findings as compelling.

“The strength of the association between skin thickness and vitamin C intake is striking,” she said. 

One of the standout findings was how efficiently vitamin C moves from blood to skin. According to Professor Vissers, the correlation between plasma vitamin C and skin vitamin C was far stronger than that observed in other organs.

“We were surprised by the tight correlation between plasma vitamin C levels and those in the skin. This was much more marked than in any other organ we have investigated,” she said.

The team also found that vitamin C circulating in the bloodstream penetrates all layers of the skin and supports healthier skin function overall. Vitamin C is essential for collagen production, which explains its widespread use in skincare products. However, it is water-soluble and does not absorb easily through the outer skin barrier. The study suggests that skin cells are far more efficient at absorbing vitamin C delivered internally through the bloodstream, particularly in the outer epidermal layer. The research was conducted in two phases and funded by Zespri International and a University of Otago Research Grant. The first phase examined vitamin C levels in healthy skin tissue collected during elective surgeries at Te Whatu Ora Canterbury. The second involved an eight-week dietary intervention in Christchurch and Germany, with participants consuming two Gold kiwifruit daily — providing around 250 milligrams of vitamin C.

Researchers observed a measurable increase in skin thickness, reflecting higher collagen production and faster regeneration of skin cells. While kiwifruit was chosen for its high vitamin C content, researchers say similar benefits are likely from other vitamin C-rich foods such as citrus fruits, berries, capsicums and broccoli. Because the body does not store vitamin C long term, maintaining daily intake is key. About 250 milligrams a day is sufficient for healthy individuals, easily achieved through a diet rich in fruits and vegetables.Agencies