Alright bros!
Compliments of bigfella over at AM board:
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Class 1 steroids - These are steroids with high affinity and binding to the androgen receptor (AR), they do not compliment each other well as they compete for the receptors with each other and tend to have fairly similar actions. Examples of Class 1's are Deca, Equipoise, Anavar, Primo, Masteron........
Class 2 steroids are those with low affinity and binding at the androgen receptor and have their effects via non-AR mediated pathways, like Class 1's they do not usually tend to stack well together, but go well with Class 1's. Examples are Anadrol, D-bol, Winny, Halo.......
The other area of greater importance and those which should form the BASE for any stack are those which possess both Class 1 and Class 2 properties, meaning having positive effects on the AR and through non-AR mediated pathways. These are Testosterone (all types) and Trenbolone.
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Keep these in mind bros when you are setting up a new cycle. It can save you time and the stress of figuring what works best with what.
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Hope this helps someone!