riboflavin

An orange-yellow crystalline compound, C₁₇H₂₀N₄O₆, the principal growth-promoting factor in the vitamin B complex, naturally occurring in milk, leafy vegetables, fresh meat, and egg yolks.

Yellow or orange-yellow water-soluble compound, a member of the vitamin B complex, that acts as a growth-promoting factor in humans and other animals.

a B vitamin that prevents skin lesions and weight loss