There are pros and cons to the various types of testosterone you could take. I'm using Androgel.
From what I remember when researching my options in 2007 (things have possibly changed a lot since then):
Monthly shots -- the thing with shots is that your levels go up right after you get your shot and slowly taper off. It's possible that your moods are a little off at the beginning and then you mellow out again by the time you need your next shot. Your options are to have a doctor do it for you or self-administer. Having developed an aversion to needles after my first bout of cancer, I kinda ruled this out quickly, even though it probably is cheap and effective.
Pills - easy but apparently not very good for your liver long term
Gel/Cream -- you have to worry about keeping your hands clean and physical contact, but it maintains your levels consistently since you're putting it on daily. It's admittedly inconvenient but works for me.
Orals shouldn't be considered.
Please excuse my ignorance on this, I am in Canada, have been blessed with naturally high T levels, and have no experience with anti-aging clinics, but I'm fascinated by the subject.
This is a myth. 200 is low for a healthy 70 year old. Without disease or T-killing medications, T levels fall very slowly with age alone.
After ruling things out, the doc prescribed me Androgel, a gel-based test delivery system. You rub it on your shoulders and it absorbs in. But you have to be careful to not let it get on other people. I had a baby girl on the way and sat there thinking that I never want to worry about touching my wife or daughter. Plus this wasn't a temporary treatment. You are a slave to it, and pay about $10/day for it. Oh, and it turns out people, especially younger men, have a higher chance of stroke on that stuff. That's no life, so I decided to try and cure it naturally.
And I did. My testosterone is normal now (forget the exact number). And I feel great. It was simple. First, I started strength training. Weights, especially compound moves like squats, will build test levels. And helps with sleep. Check out stronglifts.com if you want a good starting point.
Second I fixed my diet. Check out the book The Perfect Health Diet. I learned I was not eating enough good fat. I started using more olive oil, coconut, ghee (butter), and quality rumen meat. It made a huge difference.
Finally I cut out the stress. The startup ended up not succeeding but that had nothing to do with me deciding to ease up. I'm happy I did and learned a valuable lesson that health comes first.
So there's my story. If you are going to supplement, be prepared for a long bumpy ride. And remember you can boost it naturally.