Vitamin D test by ZinzinoViamin D test by Zinzino at home pin prick blood test Our Vitamin D Test allows you to monitor your levels of the sunshine nutrient throughout the year and determine whether the sun is doing its job or if you need help to improve your vital vitamin D levels. The test includes intuitive, easy to follow instructions and personalized recommendations on how to top up with just as much Vitamin D as your body needs, when it needs it.