Crystagen is a dietary supplement with a synthesized peptide for the immune system.It normalizes the function of the immune system by reducing its peptide deficiency and supporting protein synthesis within its cells. Crystagen is recommended to anyone whose immune system may deteriorate, especially older people and people with inflammations or viral and bacterial infections. For more information: https://peptide-bioregulator.com/product/crystagen-immune-system-peptide-60-caps/