There also are many products on the market that contain other substances like high-potency free amino acids, botanicals, enzymes, herbs, animal extracts, and bioflavanoids. Be cautious about using any supplement that claims to treat, prevent or cure a serious disease. The FDA allows other disease claims on supplement labels only if they are based on authoritative statements from scientific organizations like the National Academy of Sciences. For example, claims that you can eat all you want and lose weight effortlessly are not true. To lose weight, you must lower your calorie intake or increase your calorie use through exercise.
Most experts recommend doing both.
Claims to the contrary are false. Other questionable claims may involve products or treatments advertised as effective in shrinking tumors, curing insomnia, reversing hair loss, relieving stress, curing impotency, preventing memory loss, improving eyesight, and slowing the aging process. In addition to lacking documented effectiveness, some dietary supplements may be harmful under some conditions. The FDA monitors reports of adverse reactions to dietary supplements to identify emerging safety issues. In addition, some vitamins and minerals can cause problems for some people when taken in excessive doses.