A Chinese Odyssey: Two Treasures and Vitality Pills

Together, the two vitality pills are called Zhenlong vitality pills, 100% discoloration+growth.

This can be given to those who have never eaten Yuan Qidan.

If you have eaten Yuan Qidan, but it doesn't change color, you can eat Liuli Discoloration Dan (synthesized by two Discoloration Dan), 100% changes color and doesn't grow.