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Today is the last day of GNC's once-monthly "Gold Card Week." Get your supplements for the next month today and save 20 percent! (You know you need them anyway, so why not save 20 percent?)

It's that time again. Every month, beginning on the 1st, GNC has a special deal for its Gold Card members, where they save 20 percent on every order.

This month, they've upped the ante a bit, allowing you to save 30 percent on orders over $150.

Receive 30% Off Orders of $150 or more at GNC.com until 04.30.10.

You may find the video below "interesting," if not totally scary. I will say that I think most mainstream supplement companies make safe products. I'm not sure that they're effective, but at least they won't kill you.

However, who's to say that the latest diet pill wasn't made in somebody's bathtub?

This is NOT my condemnation of the supplement industry. Rather, it's simply a peek into how some of the unscrupulous companies operate. If you stick with name brand "basic" supplements like protein powders, creatine, amino acids, and vitamins and minerals, you're going to get what you pay for.

Beware the "proprietary blend." It might just be crap.

If you've been here before, you know that I don't use a lot of supplements. Frankly, most of them are wastes of hard-earned money. However, there are some supplements that are worthwhile – they simply work.

Supplements are costly, though. So every little bit helps – here are some coupon codes for Bodybuilding.com:

It’s GNC Goldcard Week, now through October 7.