The name "vitamin" has been given to these substances, but little is known about their chemical or physiological nature.
Instead of a camera he found a device for distilling fresh water from salt, some iron rations, and a small bottle of vitamin B1.
Moreover, he had isolated a vitamin in this protein not found in any of man's present foods.
Well, we've now discovered that this vitamin can condition the human body to stay under water indefinitely.
Iron deficiency can cause anemia, as can vitamin B12 or folic acid deficiency.
There are clear-cut cases, for example, of vitamin deficiencies that result in symptoms of psychological disturbance.
It is not always possible to specify exactly how much of a mineral, a vitamin, or an amino acid a person requires for good health.
His mother thought he might be getting a cold and gave him vitamin pills and made him drink extra orange juice.
Digestibility, as well as protein, mineral and vitamin requirements, must also be considered.
Vitamin B complex, vitamin C—and, finally, half a dozen highly questionable contraceptive pills?