Testosterone boosters may increase T levels by increasing direct production or reducing conversion to estradiol. Free-, loosely bound–, and dihydrotestosterone are the best reflection of the effects of testosterone in the body.
They help with making new testosterone and may help improve the ability to have an erection. But it doesn't seem to be helpful if the problem with erections is caused by diabetes or nerve disorders. Some testosterone booster supplements contain natural ingredients like herbs and botanicals. They may increase testosterone by increasing a hormone produced by the brain, which signals the testicles to produce more testosterone.
Some of the ingredients in testosterone boosters may increase your strength. However, this would likely happen over a long period of time. A testosterone booster can be defined as a supplement that aids your body in the production of testosterone; either directly or indirectly.