Equal, aka Nutrasweet or Aspartame, has been synthesizied since 1965 and approved by the FDA since 1980. It is used as a sweetener in thousands of products including diet drinks and many candies. It is also safe for those with sugar-intake concerns, such as diabetics, and makes a fine sweetener for pancakes and waffles when sprinkled over melted butter.
The cost of this product is comparable to my local grocery store (USA East Coast), so it might be worthwhile to buy from here if you're already ordering something else. Otherwise, I'd save the shipping cost and buy it locally on your next grocery trip.