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Talk with your doctor about whether you have normal testosterone levels. Testosterone has a peculiar relationship to hair loss. Not enough testosterone and your chest hair won't grow. Too much and it gets converted into DHT, which shrinks hair follicles. Try to have a healthy balance of testosterone; of course, because there's no testosterone test available over the counter, you'll need to seek the advice of a doctor.  Start working out. Both weight loss and weightlifting can boost a man's testosterone levels. Hit the gym, back up onto the bench press, and do some serious exercise. You'll feel stronger and grow some chest hair while you're at it. Take testosterone supplements if your doctor diagnoses you with low-T. Only take supplements if your doctor has diagnosed you. Again, if you have normal levels of testosterone and you take supplements, an enzyme will convert the excess testosterone into a follicle-shrinking hormone. Not a good recipe for hair growth. Talk to your doctor about estrogen inhibitors. Your doctor should know if you taking estrogen inhibitors is advisable for chest hair growth in your specific case. Anabolic steroids pose serious health hazards. As there are dozens, if not hundreds, of different anabolic and androgenic steroids, each with different side-effects on the body and implications for your hair, it's not considered safe to use steroids for hair growth.
Level out your testosterone. Never use steroids to aid in chest hair growth.