Infused with vitamins C and D, the St Tropez Purity Vitamins Bronzing Water Face Serum (£22) doesn't just brighten up your skin (thanks to vitamin C), it promises to mimic the effects of sunshine thanks to a high-tech proprietary technology the brand calls the "Sunshine Complex". Vitamin D is good for healthy bones, but while we create more vitamin D from direct sunlight, as we all know, the UV exposure is extremely harmful to our skin. This technology claims to help the skin stimulate vitamin D production without any sun exposure, alongside a host of ingredients like kakadu plum, peach flower extract, and avocado oil, which all work together to give your face a natural-looking, sun-kissed glow.