Weight loss. There is conflicting evidence about the effectiveness of chitosan for weight loss. Some research suggests that combining chitosan with a calorie-restricted diet might result in a small amount of weight loss. But taking chitosan, without cutting calories, doesn’t seem to cause weight loss.
Many studies on chitosan have design flaws that make their results questionable. When only the higher quality studies are analyzed, the effect of chitosan on weight loss is minimal, only about 0.5 kg (about 1.1 pounds) when taken for 1-6 months. This may not make much difference to health.
Wound healing. Early research suggests that applying chitosan to skin grafts might improve wound healing and help nerves regrow.
Other conditions.
More evidence is needed to rate the effectiveness of chitosan for these uses.