The Enlightenment Series: Vitamin D | RATIONALE


The Enlightenment Series: Vitamin D

Striking a balance between sun protection and
Vitamin D synthesis

Two things we know to be true:

1. Vitamin D is our ‘sunshine Vitamin’, sparking the release of endorphins within our bodies and responsible for that ‘feel-good factor’ we so crave.

2. The sun is also responsible for a remarkable 80 per cent of facial ageing—a harbinger of a multitude of photo-ageing concerns and, in the most serious of cases, skin cancers.

Acquired wisdom has led most of us to realise that no ‘sun-kissed glow’ is worth the glut of issues caused by exposing our skin to the sun, but how do we reconcile the need for sun protection with our bodies’ intrinsic need for Vitamin D absorption?

Understanding this dichotomy—and striking a fine balance between these two, seemingly-contradictory phenomena—is key to achieving not only optimal skin vitality, but overall health and wellbeing too.

Christie Nicolaides Solar Protection

Understanding the Solar Constant

The Solar Constant categorises the complete light spectrum that we are exposed to on a daily basis, consisting of UVA, UVB and UVC rays, Visible Light and Infrared (best known as the heat we feel on our skin).

A sophisticated sun protectant like RATIONALE’s B3-T Tinted Superfluid SPF50 uses UV filters including Titanium and Zinc to both absorb and reflect wavelengths of light, providing complete Solar Constant protection while augmenting skin’s moisturisation and barrier.

RATIONALE B3-T Solar Constant

"To enable our skin to synthesise Vitamin D3, short amounts of sun exposure–as little as 15 minutes a day–are all you need."


What about Vitamin D?

Naturally delivered via sunlight, Vitamin D plays an integral role in controlling our calcium levels and is key for supporting strong bones, muscles, and promoting general health.

A common misconception is that excessive amounts of sun exposure are required to obtain healthy doses of Vitamin D. On the contrary, to enable our skin to synthesise Vitamin D3, short amounts of sun exposure—as little as 15 minutes a day—are all you need.

Vitamin D is also essential for maintaining the skin’s own immunity and barrier integrity. In doing so, it assists with the reduction of inflammation and associated skin conditions, including pigmentation, acne, solar ageing, eczema, psoriasis and dermatitis.

The answer to achieving balance between solar protection and sufficient absorption of Vitamin D can therefore be found in using skincare which facilitates both: a daily skincare ritual providing complete Solar Constant protection while still allowing essential doses of Vitamin D to penetrate and rejuvenate our skin.

A daytime hydrator, applied prior to your SPF, like RATIONALE’s PhotoDynamic Day Cream SPF15 performs this very function, harnessing the power of light to support the skin’s synthesis of Vitamin D to brilliance-boosting effect.