Testosterone is an important hormone in the human body. But it starts to decrease each year after age 30. In some men this can be substantial. Between 19 and 39 percent of older men may have low levels of testosterone. Older men with low T have increasingly sought testosterone replacement therapy (TRT) in recent years.
Moreover is defined as besides, also or in addition to what has been said. An example of moreover is a parent telling their teenager that, in addition to them coming home late, they also didn't do their chores. in addition to what has been said; besides; further; also: used with conjunctive force.
Furthermore is used to introduce a new argument. Further states that something goes beyond what was already said. These two are clearly related, but not the same, and not interchangeable. Generally if you used further at the start of a statement where you should have used furthermore the reader will be left wondering further to what?.