Vitamin C & Skin: How It Changes You | Benefits & Science

Dietary Vitamin C Directly Linked to Skin Health, Collagen Production: New Research reveals

A groundbreaking new study demonstrates a direct correlation between dietary vitamin C intake and the skin’s ability to produce collagen and renew itself, suggesting that what you eat has a more significant impact on skin health than topical treatments alone.

Published in the Journal of Investigative Dermatology, researchers at the University of Otago, Faculty of Dentistry, in collaboration wiht scientists from Germany, have found that increasing vitamin C levels through diet leads to demonstrably thicker, healthier skin.

The Power of Vitamin C: Beyond topical Solutions

For years, vitamin C has been a staple ingredient in skincare products, prized for its role in collagen synthesis. However, the new research challenges the efficacy of solely relying on creams and serums. “The findings reinforce the idea that skin health begins internally, with nutrients delivered naturally through the bloodstream,” explained a lead researcher. Vitamin C’s water-soluble nature limits its absorption through the skin barrier, while the body efficiently absorbs it from the blood, prioritizing uptake into the outer epidermal layer.

Study Details: New Zealand and Germany Collaborate

The study followed 24 healthy adults across Aotearoa New Zealand and Germany. Participants who increased their plasma vitamin C levels by consuming two SunGold™ kiwifruit daily experienced a noticeable increase in vitamin C within their skin. This boost was directly associated with thicker skin – indicative of increased collagen production – and accelerated renewal of the outer skin layer.

Researchers conducted the study in two phases. The first phase analyzed the relationship between plasma and skin vitamin C levels using healthy skin tissue obtained from patients undergoing elective surgeries.The second phase involved a controlled dietary intervention, with 12 participants in each location.

Eight Weeks to Healthier Skin

Over an eight-week period, participants consistently consumed two SunGold™ kiwifruit each day, providing approximately 250 micrograms of vitamin C. Skin samples were collected before and after the intervention, with detailed analyses conducted in both Christchurch and Germany. German researchers, utilizing advanced techniques at the SGS Institute Fresenius in Hamburg, assessed skin regeneration through ultrasound measurements of skin thickness, elasticity, UV protection, and epidermal cell renewal.

Measurable Results: Thicker Skin and Faster Renewal

The results were striking. Participants exhibited a measurable increase in skin thickness, directly correlating with increased collagen production and a faster rate of epidermal cell regeneration. “The other really substantial finding showed a significant increase in the participants’ skin thickness levels, reflecting collagen production and an upsurge in the regeneration of their epidermal cells, in other words skin renewal,” a researcher stated.

Blood-Skin Connection: A Unique Relationship

The research team was particularly surprised by the strong correlation between vitamin C levels in the blood and the skin. “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,” one researcher noted. The study demonstrated that vitamin C circulating in the bloodstream reaches all layers of the skin, supporting overall healthier skin function.

Beyond Kiwifruit: A Spectrum of Vitamin C-Rich Foods

While SunGold™ kiwifruit was used in the study due to its consistently high vitamin C content, researchers believe similar benefits can be achieved through a diet rich in other vitamin C sources. These include citrus fruits, berries, capsicums, and broccoli. “We suggest that increasing your dietary vitamin C intake will result in effective vitamin C uptake into all compartments of the skin,” a researcher explained.

Daily Intake is Crucial

Maintaining consistent vitamin C levels is key, as the body does not store the vitamin for long periods. Researchers recommend a daily intake of around 250mg of vitamin C to achieve optimal plasma levels. “The important thing is to keep your plasma levels optimal, which we know can be easily achieved in a healthy person with a vitamin C intake of around 250mg per day. The body however does not store the vitamin, so we recommend 5+ a day, every day, with one of those five being a high vitamin C food, as a good habit to cultivate.”