This makes sense, given our body naturally produces Vitamin D from sun exposure — a luxury we only experience during the day. (ora.organic)
Unfortunately, this fat - soluble vitamin occurs naturally in very few foods; our bodies produce vitamin D when the skin is exposed to sun. (babygourmet.com)
Since our body doesn't produce Vitamin C on its own, it's crucial that you get it from the foods you eat. (rawveganlivingblog.com)