| Active Ingredient | Uses based on scientific evidence | Grade* |
| soy (glycine max [l. merr.)] | there is not enough scientific evidence to determine if dietary intake of soy affects the risk of developing colon cancer. study results are mixed, and more research is needed before a recommendation can be made. | c |
*Key to grades
A: Strong scientific evidence for this use;
B: Good scientific evidence for this use;
C: Unclear scientific evidence for this use;
D: Fair scientific evidence against this use;
F: Strong scientific evidence against this use.