vitamin supplement

Ys, followed by a subsequent decrease with increasing age. The observed decrease in tissue content of CoQ10 could accentuate the age-related oxidative damage of lipids and proteins, although this question remains to be answered. It is also important to determine whether CoQ10 cellular deficiency is general or affects only certain organelles, such as the mitochondria.

The molecular basis for the cancer-preventive activity of selenium is not known. One idea is that selenium boosts the activity of enzymes that contain the unusual amino acid selenocysteine. Such selenoproteins are rare. Mammalian genomes may encode about twenty selenoproteins, of which about half have actually been biochemically identified. All of the selenoproteins thus far characterized seem to have a role in protecting the cell against oxidants or maintaining redox homeostasis. Selenium is chemically similar to sulphur and, like sulphur, can accept or donate electrons during oxidation and reduction reactions. When selenocysteine is removed from proteins, their activity decreases dramatically. Given that most, if not all, selenoproteins have a role in combating oxidative stress, and that the selenocysteine is required for protein activity, a reasonable hypothesis for the cancer- preventive activity of dietary selenium is that it ensures that the selenoproteins are present at levels sufficient to prevent or

Vitamin K is found in cabbage, cauliflower, spinach, soybeans, and cereals.

Absorption of vitamin E is dependent upon the digestion and absorption of fat. Free tocopherols are absorbed by a non-saturable, passive process into the lymphatic circulation along with fat. About 45% of an ordinary dose is absorbed into the lymph.

The B-vitamins and vitamin C are water-soluble, which means that they dissolve in water and are carried throughout the body in the bloodstream. The body does not store most water-soluble vitamins with the exception of vitamin B-12. Other than B-12, the body uses what it needs and the kidneys excrete any excess water-soluble vitamins in the urine..