If you happen to be pregnant, you should let your doctor know that you are interested in or taking calcium supplements, as that have been known to get into breast milk. Normally, anyone can take calcium supplements, although using them in high doses may cause different and adverse reactions. If you take calcium supplements in large doses, you may experience constipation, vomiting, nausea, a loss of appetite, a dry mouth, and a loss of appetite. Also very effective with improving circulation, B3 niacin can also help to reduce cholesterol levels found in the blood. Even though vitamin B3 niacin is great as a stand alone supplement, it should also consumed with foods that contain protein, due to the fact that the body is able to convert the amino acid known as tryptophan into niacin. 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. Other symptoms include mental and emotional stress, chapped lips, and other annoying or painful habits. The most common causes of deficiency include a poor diet, alcoholism, stress, a lack of vitamins, or medicine that interferes with your ingestion of vitamins. If you are always feeling tired or feeling a lack of energy, you are probably short on the vitamins that your body needs to have on a daily basis. Over the years, studies have shown that fruits and vegetables which are organically grown are high in antioxidants, and boast a much higher concentration than those that have been produced commercially. In the busy world of today, it can be very tough to eat like we should, nor can we eat organic fruits and vegetables all the time. You can also use vitamins and supplements that contain antioxidants if you aren t able to eat the right foods that contain these precious nutrients. For more reasons than one, you should always make sure that you include foods and supplements that contain antioxidants in your diet. If you aren t taking in the right amount of antioxidants, you ll be at a risk for disease or other harmful effects.