How might behaviors affect hormones? The birdsong example demonstrates how hormones can affect behavior, but as noted, the reciprocal relation also occurs; that is, behavior can affect hormone concentrations. For example, the sight of a territorial intruder may elevate blood testosterone concentrations in resident male birds and thereby stimulate singing or fighting behavior. Similarly, male mice or rhesus monkeys that lose a fight decrease circulating testosterone concentrations for several days or even weeks afterward. Comparable results have also been reported in humans. Testosterone concentrations are affected not only in humans involved in physical combat, but also in those involved in simulated battles. For example, testosterone concentrations were elevated in winners and reduced in losers of regional chess tournaments.
Nolvadex is widely available and one of the easiest items on earth to obtain. In the . it is not classified as controlled substance; however, true legal possession will require a prescription. On the black market, nearly all anabolic steroid suppliers carry the SERM and counterfeits, while possible appear to be very rare. The SERM as with many related items is also available through research chemical labs (RCL’s). These RCL’s have found a loophole in the law that allows them to legally manufacture and sell SERM’s, AI’s, Peptides and many other items so as long as it’s for research only. This allows anyone to make a related purchase without a prescription and legally so. However, many of these RCL’s are very low grade. It’s common for their products to lose potency fast, to be unstable, and in some cases, so heavily concentrated they’re hard to dose. While there is a lot of garbage out there, there are quite a few very good RCL’s on the market. A little digging and you’ll easily find one.