Health supplements are now a common addition to our diet and in many situations they are the only solution to our health problems. However the Internet is simply flooded by SPAM and pop-up advertisements promising a quick relief from various illnesses if only we take (put a name here) health diet supplement and they are treated more and more like some kind of wonder pills. On the other hand, the benefits and dangers of using them are more and more discussed among physicians. The use of various supplements in bodybuilding process and the dangers of abusing them do not help.
The point is that health supplement really do work, but not for everybody and certainly they're not for every occasion.
Nutritional deficiencies
Basically dietary health supplements were originally developed to help people overcome their nutritional deficiencies. If, for any reason, an individual is unable to follow a balanced diet, health supplements help them to keep your organism intact. However in most cases when an individual eats healthy food (a lot of fresh fruit and vegetables. For example), health supplements are no longer needed and taking them will have only little effect (and not always a positive one).
Bodybuilding/fitness
Another common reason of taking health supplements is bodybuilding. When we want more than to be fit, the normal diet is not enough and we need to take something more serious if we hope to keep up the unhealthily quick pace of the muscles grow. That's where the health supplements come. However as they are often taken without any medical knowledge (and they need to be taken in large quantities if they are to have a visible effect), their final effects may no longer be positive.
Conclusion
In short, health supplements are OK, but only as long as people use them for the reasons they were made for - to fight nutritional deficiencies. Bodybuilding or the general need of feeling healthy are not good reasons for taking those pills (even herbal ones). Our body is a delicate mechanism and we shouldn't tinker in it too much without a serious reason.