Top BB'ers in the 70's had access to all pharma, as most top BB'ers still do today. I trust that the UGL's I use aren't bunk (blood tests can verify that) but they can't tell me if they are underdosed or not. I'd rather err on the side of "too much" than "not enough". This is also how I treat my protein intake.
When I see people saying they are on 2g of Tren, and they are still living, I often think the shit MUST be underdosed.