Table 4. Patient-reported reasons for noncompliance with the supplement during the study.
| Visit 2 | Visit 3 | |||
| Comments | n | % | n | % |
| I forgot to take it | 29 | 87.9 | 24 | 85.7 |
| I did not like its taste | 1 | 3.0 | 2 | 7.1 |
| I am using it for a long time | - | - | 1 | 3.6 |
| I could not access to it | 1 | 3.0 | - | - |
| I do not believe its effect | - | - | - | - |
| I do not have knee pain | 1 | 3.0 | 1 | 3.6 |
| I did not want to take it that day | 1 | 3.0 | 4 | 14.3 |
| Supplement preparation is difficult | 1 | 3.0 | - | - |
| I had undesired effects | - | - | 1 | 3.6 |
| Other* | 2 | 6.1 | 4 | 14.3 |
| * Specific comments for Visit 2: Nausea when taken in the evening (n=1), and it should not be taken satiated (n=1); for Visit 3: disruption due to undesired effects (n=1); the taste and odor of the supplement makes it difficult to use, I had nausea and wanted a break, then got COVID-19 and did not want to use it (n=1); I forgot to take it with me (n=1); I was travelling and could not prepare it (n=1). | ||||