All brands will contain some amount of the extract from the actual fruit, but the amount of the active substance can vary a lot.
There are plenty of fly-by-night products around(pretty much all of the ones in local stores) that only offer a very subpar purity. Often times such supplements(like ones sold at WalMart) only contain 20 or less HCA- even when they are marked as higher(this was the conclusion of a recent study).
Such low-grade products(like the ones from GNC usually) are basically scams, replete with fillers and additives and dont do much to give you the true benefits of the natural extract.
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