With so few food sources of vitamin D and so few possibilities for safe exposure to enough sunlight, vitamin D supplementation is an effective way to support your health. (energyfirst.com)
The insects» strange genitals may have evolved in response to living in caves with few food sources. (newscientist.com)
While there are few food sources that are strikingly high in magnesium content, a large number of foods contain relevant amounts of this important mineral. (whfoods.org)