http://www.bodybuilding.com/fun/catcytomel.htm
It can be stacked or alternated with clenbuterol. I usually recommend to alternate, three weeks
clen with three weeks cytomel, since
clen loses most of its benefits after a short period of time and using cytomel for extended time-periods will increase the risk of permanent thyroid failure. Neither drug is terribly expensive so I see no problem in this. Some opt to use them together for 3-4 weeks, and then use an over the counter ECA stack to bridge with for an equal period of time, but I'm not such a big fan of that. Which naturally doesn't mean its not effective, that's just a personal opinion. Running it for three weeks, one could choose for a schedule as follows: 25/25/25/50/50/50/75/75/75/100/100/100/75/75/75/50/50/50/25/25/25 µg/day. If taken for 4 weeks, then run each dose for 4 days, 5 weeks then each dose for 5 days and so on. It is extremely important that the doses are tapered on and off and that a cycle never exceeds 6 weeks at the most.
As far as adding products, no ancillaries are needed, but its highly recommended that this is only used when anabolic/androgenic steroids are also being used. First of all the extra free calories work with the steroids to enhance results, but also because an increased level of thyroid hormones can be extremely catabolic and the use of anabolic compounds to counter muscle loss is a requirement here.
Thyroid hormones are often referred to as the metabolic regulators of the body. High levels of T3 speed up the metabolism of an individual, allowing him to burn more calories and use calories more sufficiently. Generally ectopmorphic body-types have very high thyroid levels and in some cases a slight undiagnosed form of hyperthyroidism. Both hyper-and hypothyroidism can have severe consequences on an individual, such as goiters and other nasty stuff, so messing with your thyroid is not something I would advise to beginners. As with insulin, misuse of this compound can leave you dependent on exogenous T3 for the rest of your life (remember Frank Zane?). So some caution and research is required before putting Cytomel in your body. Generally cycles should be limited to 4-6 weeks tops, I recommend 3 and alternating cycles with 3-week cycles of clenbuterol. But most importantly, to avoid a crash or a shock to the thyroid function doses need to be built up over time and tapered off again. More so for cytomel than for any other drug in existence.