Carbon monoxide has a density that is about 97% that of air under normal room temperature. So, to answer the question, no, it is lighter than air. You would think, then, that it would rise. In real-world conditions, there are a lot of forces that cause the CO to mix rather completely into the air.
Growth Hormones. Growth Hormones are responsible for the development function of the entire body. Growth Hormones are peptide hormones which encourages growth and cell regeneration in both humans and animals.
Human growth hormone (hGH) is a long chain amino acid molecule produced by the anterior pituitary gland, located at the base the brain. It is a large fragile protein molecule with a molecular weight of 20,000. HGH acts on many different tissues to promote healthy metabolism. The bulk of the effect accomplished by hGH is performed by a related hormone called Insulin-like Growth Factor-1 (IGF-1), which is released predominantly by the liver and, to some extent, by other tissues in response to the presence of hGH.