The Healing Properties of Sun Radiation

We are starting to enjoy a little sun in the UK. Sunlight is not something to fear or, on the other hand, chase in extremes. Sunlight is information, a signal that our body expects, reads, and uses to regulate itself. And more than that, it can be considered a form of medicine.

Our skin is not a passive barrier against the outside world. It is an active, responsive organ, constantly sensing and translating what is happening in our environment, sendng messages to our brain. When sunlight hits our skin, it drives real biological change via the hormones it produces, such as cortisol and melatonin.  There are signals that connect our skin directly to our brain, our immune system, and overall metabolic function. In our physiology, everything connects, all of the time.

In the right dose, sunlight doesn’t just support health, it helps organise it. It sets circadian rhythm, which underpins sleep, hormones, and energy. It stimulates nitric oxide, influencing blood pressure and vascular health. It enables vitamin D production, critical for immune regulation and cellular function. And within the skin itself, it supports mitochondrial function and antioxidant defence through local melatonin production. 

This is why sunlight can be understood as medicine; as a foundational input the body requires to function properly. But like any medicine, dose and timing matter. Sunlight is also a stressor and so the benefit we get from it comes from the right amount or exposure. Too much sun, too quickly is detrimental; oxidative stress increases, inflammation is triggered, and damage pathways take over. 

Nutrition shapes how well this process works. Our ability to adapt to sunlight depends on our internal resources; antioxidants, essential fats, and micronutrients determine how effectively we can manage oxidative stress and repair tissue. When we have the right nourishment, sunlight is beneficial for our skin. When do not, we can develop sensitivity.

Protection, after enough warm sun but not too much that our skin becomes pink, is important. Ideally it needs to work with our biology rather than against it, unlike many suncreams on the market. Physical barriers or non-reactive agents such as non-nano zinc oxide can reduce excessive radiation while allowing some degree of signalling to continue. The goal is not to block sunlight entirely, but to enjoy the warmth of it on your skin without burning.