1. How old are you? What you should consider if you're 70 is different than age 40.
2. What is your level? "Low" is a vague term. Are you at 200? 300? 150? Are you experiencing any problems?
3. Androgel tricks your body into thinking it's producing enough T. Your testes shrink and reduce their output. If you don't exercise hard enough (see below) the excess turns into estrogen, giving you man boobs and prostate problems. At 70, this is no big deal. At 40, you could be increasing your risks of various types of cancer.
4. A better approach is to ensure your body is getting all the raw materials to create T naturally and then take steps to speed up your natural T production. These steps include...
a. Enough sleep
b. Reduce stress
c. High intensity, short duration exercise every day, to include weight lifting, hill reps, sprints. etc. Basically, 8 reps of 8-30 seconds of all out effort.
d. Increase healthy proteins and healthy fats in diet.
There are some other good recommendations here. Good luck.