According to a report by the inspector general of the US Department of Health and Human Services, dozens of purported weight-loss and immune-system supplements are illegally labeled and do not have appropriate scientific evidence to support their claims.
As an orthopedic surgeon, I have many patients with diabetes who tell me, "I can't have surgery because I won't heal." That is certainly not the case, however. Diabetes does affect the small blood vessels and the function of immune cells when blood sugar is high, but with proper nutrition and blood sugar management, people with diabetes are very safe to undergo knee replacements, abdominal surgery, and many elective procedures.
A dietary supplement, also known as a food supplement or nutritional supplement, contains a "dietary ingredient" intended to supplement the diet by providing an element that might not otherwise be consumed. "Dietary ingredients" include vitamins, minerals, herbs and other botanicals, amino acids, and substances such as enzymes, organ tissues, and metabolites. Dietary supplements, which may be extracts or concentrates, come in many forms, including tablets, capsules, soft gels, gelcaps, liquids, powders, and bars.
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