T3,Clen,ECA for Contests?

[Walnutz]

ECA stack which works indefinitly...

ECA stack does not work indefinitely. That needs to be cycled also.

[MIKE_XXL]

ECA stack does not work indefinitely. That needs to be cycled also.

You are incorrect, it will work indefinitely due to no down regulation of beta receptor, the shakes and speedy feeling goes away as the stimulation of the nervous system degrades but the beta receptor is NOT down regulated, theoretically it will work forever, however I would not recommend the use of anything for extended period of time...