Body building is, primarily, about doing the necessary physical exercises, as well as carefully monitoring a diet to ensure that good “fuel” is consumed, and then used towards building muscles in the body, instead of accumulating as body fat for “emergency fuel” in times of low food availability. Supplement manufacturing can play an important role here by making things faster and easier.
That doesn’t mean that body builders can suddenly eat hamburgers all the time, or stop exercising and still get bulging biceps. But it does mean that when the correct supplements are taken, in conjunction with the right diet, and intensive exercise, the burning of calories and conversion of nutrients into muscles instead of fat is much more focused and efficient. In other words, while not necessary, the use of supplements in body building can help dietary and exercise efforts get more focused, tangible results at a faster pace. They are absolutely NOT required to achieve the goals of bodybuilding, but they can certainly help those goals to be achieved faster.
Body building supplements essentially fall into two categories, the supplements that directly affect the bodybuilding process, and the supplements that are more dietary in nature. Some supplements, such as creatine, can have an impact on the size and leanness of muscle growth. On the other hand some supplements like Vitamin D, or Omega 3 fish oil, provided much needed vitamins in pure, concentrated form, without necessarily resorting to eating less healthy, fatty foods in abundance, in order to get the same nutritional value.
As with any consumable, people that are serious about body building will be interested in these supplements whether for an exercise or dietary nature, and need to stock up on a regular supply. So supplement manufacturing in this sector will always be profitable, provided you get the right people to work with on supplement formulation.