Supplements may be marketed for these health claims, but more research is needed to verify their effectiveness. Chitosan comes from the shells of sea creatures like lobsters, shrimp, and crabs.

What the research says: A 2018 review of 14 trials totaling 1,101 overweight or obese subjects found chitosan supplements slightly reduced body weight — by about 2.23 pounds — in overweight ...

One study revealed that an enzymatic reaction produces chitosan — a more suitable form for supplements (Moraru et al. 2018). Another study by Hans Merzendorfer and Ephraim Cohen(2019 ...

Limiting intense exercise and taking supplements like chitosan can help you get to normal levels. High creatinine levels may be a sign of kidney disease, so see a doctor for a diagnosis.