Juicer Jr.
That's from Q&A with Bill Roberts:
"Are there any other steroids i.e. Equipose, Anavar, that are mild on hair loss besides Deca?
Nope, in my opinion all synthetics except Deca are equal to each other, and equal to Deca + Propecia"
What does it mean? It means that Deca gets converted by 5-alpha reductase enzyme to DeHydroNandrolone, same way as Test to DHT. DHN is very weak androgen, probably the weakest and deffinately is very mild on hair. It makes Deca the safest steroid for hair.
But, using Finasteride( Proscar, Propecia) will to great degree inhibit convertion of Deca to DHT, and then Deca itself can do as much harm to hair as other strong androgens, like Winny or Dbol.