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The best place to buy pure Garcinia Cambogia is at the link shown on the top of this page. The reason you need to take the supplement on schedule every day is so your body gets used to it and can use it effectively. You want to take it first thing in the morning with a glass of water and a meal. This helps your body get used to processing it effectively to reap the maximum nutritional and metabolic benefits from the extract.
Here is a wikipedia page about Garcinia Cambogia.