Restrict results to one per category

in my table i have details about each product and one of the fields is for category.

so each item has a category given to it, ie tees, hoodies, shirts etc etc

i used the following code to go through and list all categories in table:

[CODE]
SELECT tblproducts.category
FROM tblproducts
[/CODE]

i’m using this to build a menu for the site. but at the moment it lists it like this:

tees
tees
tees
hoodies
hoodies
shirt

and so on.

how can i restrict it to only show each category once?

do i need a seperate table with just categories in or can i limit each one?

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