Clinical Studies Despite increasing preclinical evidences of the involvement of seleno-GPxs in cellular radiosensitivity, there is no such clinical trial reported yet that focused solely on examining the effects of seleno-GPxs for modulating the radiation response of normal and/or tumor tissues
In the first reaction, L-cysteine and L-glutamate are combined by the action of the enzyme called glutamate-cysteine ligase (GSHl, 6.3.2.2), generating the intermediate y-glutamylcysteine (-EC)

Beef liver, cooked, pan-fried (3 ounces) Amount in micrograms (mcg): 70.7 mcg Clams (without shells), cooked (3 ounces) Amount in micrograms (mcg): 17 mcg Oysters, eastern, wild, cooked (3 ounces) Amount in micrograms (mcg): 14.9 mcg Nutritional yeast, fortified Amount in micrograms (mcg): 8.324 mcg Salmon, Atlantic, cooked (3 ounces) Amount in micrograms (mcg): 2.6 mcg Tuna, light, canned in water (3 ounces) Amount in micrograms (mcg): 2.5 mcg Beef, ground, 85% lean meat (3 ounces) Amount in micrograms (mcg): 2.4 mcg 2% milk, 1 cup Amount in micrograms (mcg): 1.3 mcg Yogurt, plain, fat free (6 ounces) Amount in micrograms (mcg): 1 mcg Breakfast cereal fortified with 25% of daily value Amount in micrograms (mcg): 0.6 mcg Cheddar cheese (1.5 ounces) Amount in micrograms (mcg): 0.5 mcg 1 large egg, whole, cooked Amount in micrograms (mcg): 0.5 mcg Turkey, breast meat, roasted (3 ounces) Amount in micrograms (mcg): 0.3 mcg Vitamin B12 Overdose: Key Takeaways Vitamin B12 is a crucial nutrient that supports a variety of important bodily functions, including red blood cell formation, neurological health, and DNA synthesis

Reeves SG, Meldrum C, Groombridge C, Spigelman AD, Suchy J, Kurzawski G, Lubinski J, McElduff P, Scott RJ