Clenbuterol can be taken to a higher level of potency by adding the T3 Cytomel to your regimen. As with Clenbuterol, T3 Cytomel should not be taken for long periods of time with no breaks in-between. It shouldn’t be used for more than any three week stretch, or else you risk a permanent thyroid insufficiency. After a three week course you should stop for at least three weeks. Since it can have an effect on thyroid function, a check with a physician is highly recommended to ensure your thyroids are healthy to start with; before beginning Clenbuterol and T3 Cytomel usage.