Alan Ritchson calls testosterone therapy a "wonder drug" for men entering their 40s and says it's the only way he'll survive 20 seasons of 'Reacher.' After depleting his natural hormone levels training for Season 1 of Reacher, Ritchson says getting his blood work checked and starting testosterone changed his life both mentally and physically: Alan Ritchson: "Once I got on testosterone, I felt like a brand-new person. It makes my job so much easier because there is way less wear and tear on my body I don't have to push myself to the breaking point just to maintain my size. I'm 40 years old now, and for guys in their late 30s or early 40s who feel themselves starting to slow down, testosterone is instrumental in so many mechanisms across the body. It stabilizes your mood, helps carry hemoglobin to oxygenate your cells, makes you feel more awake and alive, and helps process fat while building muscle. It really is like a wonder drug.