Can vitamin C make skin aging worse?

Experimental data shows that vitamin C combined with UVA exposure (present in sunlight) can increase the concentration of Reactive Oxygen Species (ROS) in skin. Because ROS drive oxidative damage associated with skin aging, topical vitamin C applied to sun-exposed skin can be pro-aging rather than anti-aging.

What is ROS and why does it matter for skin aging?

ROS stands for Reactive Oxygen Species, highly reactive molecules that damage proteins, lipids, and DNA in skin cells. Elevated ROS is a well-established driver of wrinkles, loss of elasticity, pigmentation changes, and other visible signs of aging.

What is UVA and how does it interact with vitamin C?

UVA is Ultraviolet A radiation, the longer-wavelength component of sunlight that penetrates deep into the skin. In the presence of UVA, vitamin C (ascorbic acid) can participate in reactions that generate additional ROS rather than neutralising them.

Did the IF1 team predict this result in advance?

Yes. Based on the underlying chemistry of ascorbic acid under UVA exposure, the IF1 team predicted that vitamin C could increase ROS in sun-exposed skin before running the experiment, and then designed the experiment to test that prediction.

Vitamin C can make aging worse

Bar chart comparing Reactive Oxygen Species (ROS) concentration in skin under UVA exposure with and without vitamin C — ROS is higher with vitamin C, indicating a pro-aging effect in sunlight

[ROS] is Reactive Oxygen Species concentration. UVA is Ultraviolet A, which is in sunlight. This figure shows that with vitamin C and UVA, ROS concentration is higher (not lower) than when vitamin C is absent. This suggests vitamin C can be pro-aging, not anti-aging, when applied to skin exposed to sunlight. Incidentally, from our chemistry expertise, we predicted this result before we observed it, which is why we looked for it. You are in expert hands now.

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