Have his T level checked by a Dr. If it's low the Dr. can prescribe a replacement. My dh has VERY low T and uses a T gel. It makes a huge difference in him (mood, how he feel physically, etc). Just a heads up, they're VERY expensive if your insurance doesn't cover it. . . About $400-$500 for a month's supply. You can also go to the drug's website and get a coupon for $40 off each month for a year. There's two brands and they both have Q's. There is also an injection he could take that is much cheaper, but it didn't work quite as well for my dh.