Side effects reported by the patients during the study
| Side effect | Glucosamine group | Placebo group |
|---|---|---|
| The number of patients with symptoms are reported. In brackets is the duration of the side effect (in days) as reported by the subjects (some subjects reported more than one of the listed side effects at the same time). | ||
| Nausea/vomiting | 1 (1) | 2 (7–14) |
| Gastrointestinal upset/cramps | 4 (7–28) | 3 (14–21) |
| Headache | 2 (7–14) | 4 (5–21) |
| Bloating | 1 (28) | 1 (7) |
| Dry mouth | 2 (28) | 0 |
| Tenderness in knee | 1 (28) | 0 |
| Total | 11 | 10 |