Adelle Davis, nutritionist
Nutritionists believe Vitamin C helps heal a plethora of health problems. But because it's used up in the healing process, they recommend taking it regularly.
I find it interesting that most animals produce Vitamin C, but humans lack the enzyme required in the last step of synthesis. I have no Scriptural proof, but I have a hunch God created our bodies to produce vitamin C but He removed that ability in Genesis 6:3 to limit our lifespan.
Whether our bodies ever produced Vitamin C or not, it is a good analogy for good Christians. We can use our energy to bring healing and wholeness to our world by detoxifying the poisonous influences. It's a bit like being the salt of the earth.
Resource: Wiki Vitamin C