We know Vitamin D can be quite important for the immune system, so one time I did an experiment with some white blood cells, and I wanted to make sure there was enough Vitamin D.
We didn’t have any spare in the lab but because Jo, one of my friends, was so tanned I knew she had been on a very sunny holiday! People make loads of Vitamin D when they’re exposed to sunlight so I asked her if she would mind donating some blood :D. I chucked away all of the cells so there was just the serum remaining – with loads of Vitamin D! Then I added that to my experiment.
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