Saying that theobromine and caffeine are pesticidal isn't particularly informative. Most secondary plant metabolites are likely to be pesticides, since there's

Saying that theobromine and caffeine are pesticidal isn't particularly informative. Most secondary plant metabolites are likely to be pesticides, since there's a tremendous benefit to discouraging small animals from eating your lignified cells. Ascorbic acid is also a pesticide and fungicide, can dissolve bones down to calcium carbonate, yet it is critical to human life.