The O/U certifies Light and Fluffy ESL (Liquid Eggs) O/UD (dairy) products. The products contain dairy as indicated in the ingredients and allergens statements. Some packaging was printed with an O/U symbol, without the D (dairy) designation.
From The O/U: Happy Day Whey Protein
The O/U does not certify Happy Day Whey Protein. Some bags bear an unauthorized O/U mark.