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Reducing weight is not so easy, dieting and regular exercise help to maintain weight but they are not very effective for significant weight loss. Many people resort to weight loss supplements to get better results and therefore there are various kinds of weight loss pills available in the market that claim to safely lose weight. Some of them are herbal medications and some are prescription medications. It is quite confusing as a customer to choose best option among various available alternatives.All the slimming pills are not effective and safe, so people should gather information and know about these slimming pills before buying them. Slimming pills works in various ways like they works as appetite suppressant and fat inhibitor. AS a fat inhibitor, it helps in less calorie absorption by the body. Herbal Slimming PillsHerbal pills are made from herbs and organic plants that have some medicinal properties. Herbal pills are considered to be safe, efficacious and cause no side effects. But you need to be very careful while choosing a herbal treatment for weight loss because all herbal pills are not effective; some of them contain no effective ingredients and they offer false promises. Herbal pills often lack clinical evidences and are not approved by any authority. However, Hoodia, green tea and Acai berry pills are well known herbal weight loss pills. Hoordia pills works by suppressing the appetite and reduces the daily calorie intake in natural way.Non-Prescription Slimming PillsOther than herbal slimming pills, various non prescription weight loss pills are available in the market. Alli is one such well known non prescription slimming pill, which is available over the counter. Alli contains orlistat as its main ingredient. It works by blocking the fat digestive enzymes in stomach, hence around a quarter of the fat people eat, is not digested properly but leaves the body in stools. Prescription slimming pillsXenical is a prescription only slimming pill by Roche pharmaceuticals. Xenical can only be purchased with a prescription and it may only be used by people with a BMI of 30 or more than 30. People can also buy xenical online from any online clinic in UK. Xenical and Alli contain orlistat as their main ingredient. Xenical is twice the strength of Alli in dosage, i.e. 120mg. weight loss pills which are prescribed under doctor's guidance are usually recommended when the patient can't lose weight via other available traditional methods. The side effects of these slimming pills are known and taken into consideration when prescribed. However, it's not necessary that everyone who takes prescription slimming pills experience side effects. All herbal medications are not regulated by FDA (Food and Drug Association) while prescription medications are approved by the FDA in UK. The main point that makes a difference between herbal pills and the prescription pills is that herbal pills manufacturer only relies on smaller scale clinical testing whereas prescription medicines undergo a number of clinical trials and tested at various stages. Scientific claims can also be made for their efficacy and safety; hence prescription slimming pills are more reliable.