remember not all homebrew is equal.....he could of had stuff made with toxic substances left in, non sterile bacteria, or raws that were rat poison for all anyone knows.
Whatever you make immediately takes out a least one step in the process that all UGLs go though so that in itself takes out more room for error or bad product.
Tren from US obtained cattle supply is regulated as to amount listed, and what the active ingredient is. Nothing obtained from china or from buddies has the same guarantees