There's a lot of competition in the diet supplement industry. With so many options to choose from how does someone know which one to buy? Read on, dear reader, as we have put the top supplements to the test. We have ranked them in order of their effectiveness.

Phentramin - Coming in at number one for a number of reasons, Phentramin is the most effective diet supplement we have ever seen. Unlike many supplements, Phentramin does exactly what it says it will do- and it does so with no or little side effects.

Phentramin is taken via two doses (one in the early morning and early afternoon) and integrates seamlessly into anyone's routine. The pills themselves are easy to swallow and didn't leave us with any bad breath after we took them.

Value: 4.5/5 Effectiveness: 4.5/5 Availability: Online Side Effects: Little/None.

Tru Hoodia Complex - A good value and a good product. Full benefits took a bit longer than Phentramin, but at the end of the test period True Hoodia Complex did its job. We saw little side effects. Though we'd recommend Phentramin, True Hoodia Complex will work if you are unable to find Phentramin.

Tru Hoodia Complex is taken before each meal. At three meals a day this gives you a 20 day supply. Though simple enough to take, we imagine that many people would simply forget to take the pills with them when they went out or while they were at work.

Value: 4.5/5 Effectiveness: 4/5 Availability: Online Side Effects: Little/Few Fast-Action Hoodia Diet - Fast-Action Hoodia Diet combines the main ingredient in all Hoodia pills (Hoodia Gordonii) with a green tea extract to create a supplement that controls your appetite while giving you more energy to boot.

This product should be taken before each meal (up to three times a day). As well, the manufacturer warns against taking Fast-Action Hoodia Diet in the late evening as it contains natural caffeine from the green tea.

Value: 3/5 Effectiveness: 3.5/5 Availability: Online Side Effects: Restlessness

Hoodia Gordonii by LA Naturals - This one is different from the other products reviewed because it is taken as a drop as opposed to a pill. It comes in the form of a medicine dropper, and you put 30 drops into a large glass of water approximately 20 minutes or so before your meal. It does not contain any other ingredients or additives- it is only an appetite suppressant.

We saw good results with this one, but there are other products that offer the same results (and often a bit more). If increased energy isn't a big concern for you then this may be what you're looking for. However, we ranked this one last because Phentramin and Tru Hoodia Complex did what this product does - and more - while also offering other benefits.

Value: 3/5 Effectiveness: 3/5 Availability: Online Side Effects: Little/None