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Glucosamine and N-acetylglucosamine, commonly labeled NAG, are both recognized as functional ingredients by South Korea’s Ministry of Food and Drug Safety. But the agency assigns them different potential benefits, daily intake levels and safety precautions.
Recognized Uses and Daily Intake
South Korean regulators say glucosamine may help support joint and cartilage health. NAG — also listed as N-acetylglucosamine or N-Acetylglucosamine — may help support joint and cartilage health as well as skin hydration.
The recognized daily intake is 1.5 grams for glucosamine, compared with 0.5 to 1 gram for NAG. Consumers should check labels carefully because the ingredients are not interchangeable.
Safety Precautions
Pregnant or breastfeeding people should avoid glucosamine. Those with liver or heart disease, high blood pressure, diabetes or asthma, as well as people preparing for or recovering from surgery, should consult a health care professional before taking it. The same guidance applies to people taking medications such as anticoagulants.
Children, pregnant people and those who are breastfeeding should avoid NAG. For either supplement, people with crab or shrimp allergies should use caution when the product is made from those shellfish.
Anyone who experiences an adverse reaction should stop taking the supplement and consult a health care professional. The guidance is based on public data from South Korea’s food and drug safety regulator. Health functional foods, the Korean regulatory category for these products, are not medicines, and people with medical conditions or those taking medication should seek professional advice before use.
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