SARMs do not suppress endogenous testosterone production as much as exogenous testosterone does. The reason for this is that the androgenic to anabolic effects of exogenous testosterone are 1:1. But for SARMS, it’s typically at least 10:1, meaning that the user will have higher anabolic effect than androgenic effect. The androgenic effects suppress endogenous (self-made) testosterone.
Scientists aren’t yet sure just how much SARMs will affect testosterone over a long period of time, but if using recommended doses, it doesn’t seem to plummet testosterone levels enough to notice a difference in most cases so far. Some researchers choose to cycle the use of SARMs to get a better scope on its effect. Some even choose to follow up with blood work just to keep testosterone levels in check.
It’s also important to be familiar with side effects before use of any type of drug. Side effects for lower-than-normal testosterone include tiredness, fatigue, low energy, and low sex drive. Basically, if you’re feeling tired and down in the dumps, your testosterone could be low. Additional studies are being done to test the longevity of testosterone dips in order to better regulate the use of some specific SARMs. The good news is that SARMs are specific to certain tissues and avoid the testes to prevent other problems.