It’s essentially a signal that the bottle contains a special seasonal formulation.
This is another question that surprises many people.
If some consumers enjoy the sugar-sweetened version, why isn’t it available everywhere throughout the year?
The answer is that the yellow-cap version is primarily produced as a seasonal product associated with Passover in markets where there is sufficient demand.
That means you may see it appear on store shelves around the holiday and then disappear again afterward.
Its limited availability has
