Vitamin K is a fat soluble vitamin that is mainly known for being a blood clotting factor, but it has other actions and is often recommended to be taken with Vitamin D.
Since Glutamine is an amino acid, it is a building block of protein. It also has many other functions, including affecting the functioning of nerves, intestines, and the immune system.
Glutathione is composed of three amino acids: glutamic acid, cysteine and glycine. Among other actions in the human body, it serves as an antioxidant and supports the immune system.