I want to get a verdict on this once and for all because as i was doing my research i came across a few posts where vets and the biology/chemist scholars amongst us came to the conclusion that Diphenhydramine HCL DOES NOT up-regulate our beta-2 receptors after clenbuterol down-regulates them.

If not, what does? Will ketotifen really up-regulate them? Or is our best option time off clen, letting the receptors recover?

So far the only thing i know that seems to work at up-regulating the receptors is cytomel (T3) which for me at least makes the clenbutarol more effective for a longer period of time.

What are people opinions?