Supplements are a huge industry. The biggest problem is that they aren't regulated and most people are being scammed. There was a recent study on St. Johns Wort and a bunch of other supplements and tests came back from CVS, Walgreen's Walmart, GNC, etc and they all were lab tested to have 0-10% of what people were buying. So...basically, they are a placebo.
I know you may be looking at protein supplements, etc... Here's my recommendation. Consider taking magnesium supplements to increase your oxygen intake since most people don't eat enough nuts in their diet. 250mg-400mg daily is a good amount to shoot for....so consider taking a 250mg dose of Magnesium in solid pill form.
Other than that, I would recommend fish oil for your heart and joints. It helps a lot with cholesterol too... You won't see much difference, but fish oil is proven to do good things for you and it's hard for the companies to rip you off at the end of the day. Tip: Keep these in the freezer and take them at night to avoid indigestion. I take 2 capsules per day.
I'm in agreement with SlitheryDee. Typically, you won't see a lot of benefit from supplements. They honestly are preying on people who want an edge or don't want to have to put forth as much time or effort...unfortunately, there's not a quick fix and they do not make that big of a difference at the end of the day.