This suggests that beta-cryptoxanthin absorption and metabolism may be quite different from the absorption and metabolism of lycopene and other carotenoids. Specifically, it suggests either that beta-cryptoxanthin itself is absorbed unusually well or that the citrus fruits that are the primary food sources of beta-cryptoxanthin in the diet are much more bioavailable than the tomato products that are the major source of lycopene. The investigators hypothesize that adults absorb a significantly greater amount of beta-cryptoxanthin than lycopene even when both carotenoids are supplied in comparable amounts in a similar matrix.