The real issue is the supplement industry marketing test supplement products as anabolic boosters (remnants of "energy" supps come to mind for those who feel they need an energy boost) as the means to build muscle mass. My question is why take any supplemental testosterone when there's no clinical evidence that you're deficient in this hormone. Have you taken a blood test to verify that your testosterone level is low? If not, then why would you consider taking a supplement that has unwanted side effects? It makes no sense to me.
More concerning is the possibility that your natural test levels will be compromised from taking the supps and as a result, testicular shrinkage may occur (your testicles produce most of the testosterone in your body). You might as well inject yourself with steroids while you're at it. Do you see my point? Taking artificial hormones is not something to be trifled with as the side effects can be very undesirable. In other words, the risks will undoubtedly outweigh the benefits. Let me count the ways: infertility due to low sperm count, liver problems, male breast growth, increased male pattern baldness, possible harm to prostate health, increased risk of blood clots, congestive heart failure, and worsening of urinary symptoms (JAMA Internal Medicine, 2013).
There are legitimate reasons for low T. Lifestyle is primarily the reason why many men are low in test. Regular exercise is known to boost test along with having enough saturated fat (i.e., lean red meat, egg yolks, etc.) and certain micronutrients (e.g., zinc, magnesium, etc.) within the diet. Endurance training (e.g., marathon running) can compromise test levels as well as overtraining (i.e., high intensity level, lack of recovery time, etc.). Lack of sleep, daily stress, medication usage, as well as overindulgence in alcohol may also lower testosterone levels.
BOTTOM LINE: Testosterone supplements are being oversold to consumers who, for the most part, should NOT be taking them. Simply exercising will boost your natural testosterone level. So instead of relying on potentially dangerous supplements, you should get adequate exercise, eat healthier foods, reduce medication usage if possible, and lose bodyweight (there is a correlation between obesity and lower testosterone levels in men).