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Many users claim to experience what seems like a temporary diminished cardiovascular and pulminary capacity during Trenbolone use, which seems to subside shortly after Trenbolone is discontinued. This particular side effect, like most, is dose-dependent, where many users can experience very little to no limitations in cardiovascular and pulmonary capacity at low Trenbolone doses, and others report more severe reduction of the same functions in higher Trenbolone doses. This is the result of Trenbolone’s effect on the body in increasing amounts of the prostaglanding F2Aplha. What results is bronchial constriction, making it more difficult for the user to draw large amounts of oxygen into the lungs, especially during aerobic training. Some individuals do not experience this particular Trenbolone side effect at all, while others do not experience it when Trenbolone doses are administered below a certain dose. This Trenbolone side effect is not considered life-threatening, and often the worst case would find the user’s respiration harder and heavier during periods of physical exertion that did not occur prior to Trenbolone use. This particular side effect, as mentioned, is only temporary and should subside not very long following termination of a Trenbolone cycle. The only caution when it comes to this side effect is that individuals suffering from asthma should be aware that this potential side effect can cause serious problems, especially if severe asthma attacks occur. Therefore, asthma patients should exercise appropriate responsible decisions as to whether or not to use Trenbolone.