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This table was created by one of the authors of this article.
| No. | Search | Result |
| #1 | "collagen" OR "hydrolyzed collagen" | 4827 |
| #2 | oral supplementation | 4709 |
| #3 | "skin rejuvenation" OR "skin aging" | 1106 |
| #4 | hydration skin | 472 |
| #5 | elasticity skin | 442 |
| #6 | #1 AND #2 AND #3 AND #4 AND #5 | 6 |
| Total: 6 | ||
