Crystagen

Crystagen is a synthetic tripeptide Glu-Asp-Pro (EDP), which is the primary active fraction of Thymalin — a heterogeneous polypeptide extract derived from calf thymus. It acts as an immune-modulating bioregulator, functioning as part of the KNDy-equivalent system for immune regulation in the Khavinson bioregulator framework.

**Vendor mislabeling warning:** Many research peptide vendors incorrectly label Crystagen as an "eye" or "vision/lens" peptide. This is factually incorrect. Crystagen (EDP) is an immune/thymus bioregulator. The eye-related peptide in Khavinson's bioregulator system is Retinalamin (also called Visoluten or Retinalamin complex) — a distinct compound from bovine retinal tissue. Crystagen has no published evidence for ophthalmic applications.

Crystagen (EDP) acts through the Khavinson-class peptide bioregulator mechanism:

- **DNA and histone binding:** EDP interacts with double-stranded DNA and histone proteins in thymic and immune cells, influencing chromatin organization and gene expression - **HSP upregulation:** Increases expression of HSPA1A (HSP70) by approximately 2-fold — a heat shock protein with roles in protein folding, stress response, and immune cell signaling - **Cytokine normalization:** Normalizes IL-6 secretion, reducing chronic low-grade inflammation associated with immunosenescence - **T-cell restoration:** Increases CD3+/CD4+ T-cell counts and normalizes CD4+/CD8+ ratio in aged subjects — the primary immune phenotypes associated with thymic involution

In irradiated rat thymus (an accelerated aging/immunosuppression model), Crystagen preserved the cortex-medulla architecture and restored thymocyte proliferation, consistent with thymoprotective activity.