There are so many different dieting products available, from dieting pills to potions to tablets.
The safest advice when deciding to take any form of dieting product; pill, potion or tablet is to seek either qualified medical advice, or stay within the guidelines of the manufacturers - never exceed the daily dosage in a pursuit for quicker results.
Its far safer to totally avoid taking these products. When you can begin to believe that the diet industry is all about making money, you can then understand why marketing and advertising got you to buy the potions and pills.
Certain products and companies work at trying to achieve a good result for you and their products / services will assist with your aim, unfortunately the bad far outweigh the good.
Look for companies that have been around for a number of years, that have spent money on research (not just advertising) and ideally those that promote a healthier lifestyle - exercise and also natural foods.
If you find that your suffering from headaches - stomach cramps or dizzy spells, stop taking the product immediately, seeking medical advice if you still feel unwell 24 hours later.