Vitamin C
It’s not like it is hard to find good information about vitamins, but here is one nice and easy overview. Also, I feel kind of bad for posting Kitty like this, but she healed up fine after eating some oranges, I promise 🙂
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U.S. National Libraries of Medicine, MedlinePlus “Vitamin C” https://medlineplus.gov/ency/article/002404.htm last accessed 6. february 2021