With millions of dollars in revenue each year and over 100 chains throughout the United States, GNC is a dominant name in the world of vitamins and supplements. If you need to take vitamins or supplements but aren t sure what you should take, you should consult with your doctor. Vitamins and supplements are a great way to get minerals and nutrients to your body, although they should never, ever, be used to replace food. These days, you can find supplements more sophisticated than ever, available in many different forms such as liquid, capsules, pills, and teas. There are some that are still home grown, although they aren t as popular as those that are commercially supplied. In general, nutritional supplements are taken to help with diets that are missing vital nutrients and minerals. The symptoms of vitamin deficiency will normally present themselves when the lack of vitamins is at an advanced level. Those who don t get enough of vitamins A, B1, and B2 for example, will always feel tired, along with a loss of appetite. Other symptoms include mental and emotional stress, chapped lips, and other annoying or painful habits. Even though you can look for vitamins that provide energy, it would be in your best interest to find those that can be effective with fighting fatigue as well. There are vitamins, nutrients, and supplements that are great for fighting fatigue and helping the body stay alert. The vitamin known as NADH is very powerful for energy, although many people aren t aware of it. The most prominent functions include support of the immune system, joints, tissues, along with aiding in cell growth. Zinc supplements have also been proven to eliminate sexual dysfunction, boost sexual function, aid in the health of the hair, and help with skin wound healing. No matter how you look at it, zinc plays an important role in the function of most of our senses, which includes the ability to taste, smell, and also sight. Funk was the first to discover vitamins as we know them today, although vitamin A was actually the first one discovered, hence the letter A in the title of the vitamin. You can find vitamin A in natural foods such as oranges and yellow fruits. It can also be found in vegetables as well, such as spinach and fats.