In placental therapy, extracts of placenta containing polydeoxyribonucleotide (PDRN), enzymes, nucleic acids, amino acids, peptides, vitamins, trace elements, minerals and growth factors are normally administered via intramuscular injection. Administered placental extracts are readily absorbed by binding to specific receptors present on the surface of targeted cells followed by stimulating inactive or damaged cells, tissues and organs in the body, thus providing tissue repair and regeneration. In addition, placental extracts also exhibit many other therapeutic properties and act as a stimulant for tissue repair, wound healing, immunomodulation, anti-inflammatory, cellular proliferation and tissue regeneration.