Testosterone can be administered parenterally , but it has more irregular prolonged absorption time and greater activity in muscle in enanthate , undecanoate , or cypionate ester form. These derivatives are hydrolyzed to release free testosterone at the site of injection; absorption rate (and thus injection schedule) varies among different esters, but medical injections are normally done anywhere between semi-weekly to once every 12 weeks. A more frequent schedule may be desirable in order to maintain a more constant level of hormone in the system.  Injectable steroids are typically administered into the muscle, not into the vein, to avoid sudden changes in the amount of the drug in the bloodstream. In addition, because estered testosterone is dissolved in oil, intravenous injection has the potential to cause a dangerous embolism (clot) in the bloodstream.
A thermogenic is a broad term for any supplement that the manufacturer claims will cause thermogenesis , resulting in increased body temperature, increased metabolic rate, and consequently an increased rate in the burning of body fat and weight loss. Until 2004 almost every product found in this supplement category comprised the " ECA stack ": ephedrine , caffeine and aspirin . However, on February 6, 2004 the Food and Drug Administration (FDA) banned the sale of ephedra and its alkaloid , ephedrine, for use in weight loss formulas. Several manufacturers replaced the ephedra component of the "ECA" stack with bitter orange or citrus aurantium (containing synephrine ) instead of the ephedrine.
I'm 33 and 1st used of it was 2 years ago while I weighted 117 pounds. I was going to gym 6 times a week and eat 2000-4000 calories per day since last 15 years and stay at 117pounds well I tried everything to gain instead of maintaining my weight. Pecfect for fast metabolism, I used for 45 days with 1 jar of mass tech and gain 40pounds and being 157pounds. My chest pass from 36 inchs to 42 inchs. Since 2 years that I didn't used any additional product and I have been maintained 147 pounds and 39 inchs of chest. I'm proud to keep this 30 pounds and thinking to get another jar now to see if I will goal 175 pounds.