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There are several different forms of testosterone in the market, some are more effective than others. Some people who take testosterone want it to be absorbed into the bloodstream faster, and also want to take less. Most people don't want their testosterone to be absorbed in the bloodstream, and therefore don't take testosterone in their diet, unless they want to. They are interested in taking it in pill form, as this will give them the best results, since their testosterone levels will drop faster. The pill is a little more difficult to absorb than the patch, because of the size of the hormone molecule. For this reason, people take a patch. Also, the pills don't work for everyone, since a few people have a problem that the patches don't work for them, and therefore they take the pill in an alternative form.
The patch is much more effective at lowering testosterone than the pill. This is because the patch contains an inactive ingredient that has the effect of increasing levels of testosterone.