Supplements are vitamins, minerals, herbs, and so on that are meant to help us complete our bodies nutritional needs. They are NOT meant to replace good eating habits. The whole concept seems to be misunderstood.
There are really only a few things to consider about supplements.
1. Quality. My recommendation is USANA Health Sciences (http://www.usana.com/). They are a general health support supplement meant to give you a solid base of nutrition to work from. You won't find a line of targeted amino acid therapy with them, that is just not what they do. What they do have is the best* multivitamin/mineral supplement with a selection of optimizers to expand on an individual's needs.
2. Diligence. It is like brushing your teeth. It has to be done daily. Waiting until Saturday and just brushing for 30 minutes is not the same as brushing every day for 5. Supplements have to be taken daily to be useful. They just can't work if they are not in your body.
3. Consistency. I almost always get asked, "What will I feel and how long will it take?" Generally, you may or may not have a noticeable change. Does it really matter? Are you expecting drastic changes in a day? When change happens over time it is harder to notice.
The thing to remember is that supplements do not replace good eating. They add to it. And please, don't be fooled by thnking that the foods around today offer a complete nutritional profile. Even the organic stuff (which is almost all I will eat) doesn't have it. Organic means they don't add chemicals and poisons, it does NOT mean that they are complete nutritionally.
Lastly, please don't buy supplements off the shelf at the grocery stores. They offer what is going to make them money not what is going to make you healthy. Some of the poorest quality supplements out there are Centrum, Kirkland Signature (Costco), and pretty much any grocery store brand.*
Do your health and that of your family a great help- use USANA supplements daily. And remember, if you want help determining your nutritional needs I can order labs and blood tests to dial in your specific needs.
*This statement is not FDA supported. It is not opinion as 3rd party companies have independently ranked USANA as the top supplement. (Comparative Guide to Nutritional Supplements, MacWilliams).