I don't know for sure, but I suspect that thinking comes from the old days before the current UGL scene. I can't imagine why a well established lab would fake primo. A sketchy, fly by night lab? Yeah, but they might fake anything.
I ran a very conservative dose of primo for 28 weeks this year. Honestly, I stopped because I was bored, and wanted some excitement in my life. Hello, tren!
With primo I didn't really feel like anything was happening. No sides, no anything. Then one day I looked in the mirror and went "HOLY SHIT!"
Expensive tho.
Reading up about DHB, it does sound interesting. I'll probably try it sometime.