Collagen is a hard, insoluble and fibrous protein that makes up one-third of the protein in the human body. 3 In the majority of collagens, the molecules are packed together to form very similar long thin fibrils. 4. Collagen is the most common protein found in mammals.ere are some key points about collagen. More detail and supporting information is in the main article. 25-27. 1  Protein makes up around 20% of the body's mass, and collagen makes up around 30% of the protein in the human body.
A prolactin test is a blood test that measures the level of the hormone in your body. Find a obsetrician or a gynecologist or a endocrinologist near you.
Prolactin is a hormone produced in the pituitary gland in the brain. It is the hormone that causes milk production in the breast. Both men and women have the hormone. If there is a tumor in the pituitary gland, the blood levels of this hormone can be elevated.