Head to a Chinese herbal remedy shop, and order whatever herb you want. Drink the herb with hot water, and some lemon in there for flavour (and general goodness too). This <link removed> is a good site with all the best herbs and some nice information too. It’s smart to take natural herbs as they have absolutely no side-effects, and their goodness far-reaching.
If you still want to take pills for easiness’s sake, choose the herb(s) you like the sound of, and procure them in pill-form. You can purchase ‘em all over the place - across the Internet, from herbal remedy shops, food nutrition shops, and probably more. It works out cheaper, and you know exactly what you’re putting into you.
Personally, I would never trust a pill unless it was 100% natural and pure, I.E. Not a blending of more than one herb. You can get everything you need from the food you eat, and everything else is attainable from herbs – humans don’t need anything else, ‘specially not something man-made and probably cancerous.
Take a look at my ‘Hi’ topic to see what herbs I take, which may be of interest to you, Tomico dear sir. :)