So far I have Bearshaek (my prototype self-destruct mechanism), 2M2B + Loperamide combo, SN, Cerberin Cocktail, and Yew Tincture.
The yew is my ideal method, but I only have the prototype, which isn't enough to do it's job. So, I guess for now, my best shot is Cerberin. That isn't to say I'm giving up on making the extract however.
I'm not gonna make tell you what's best for you as with all my methods, it takes a great level of knowledge and research. And I'm pretty much suited for this kind of method.
Check out the resources and decide which os right for you. Each of us have a style and a particular level of skills. And with whatever you lack but want to obtain that method, level up. Moneymaxx, alchemymaxx, drugmaxx, gunmaxx, etc.