pTH (1-37) (human) is a fragment of parathyroid hormone (PTH). pTH (1-37) (human) induces the cAMP formation and increases alkaline phosphatase activity. pTH (1-37) (human) increases growth, bone calcium content, and bone mineral density (BMD) in uremic animals. pTH (1-37) (human) has the potential for the research of osteoporosis.

cis-4-Hydroxy-D-proline belongs to the class of organic compounds known as proline and derivatives. Proline and derivatives are compounds containing proline or a derivative thereof resulting from a reaction of proline at the amino group or the carboxyl group or from the replacement of any hydrogen of glycine by a heteroatom.

GK921 is a transglutaminase 2 (TGase) inhibitor.