Is lemon juice concentrate stronger than lemon juice?

The juice in the little yellow squeeze bottle is concentrated, but the juice in the larger bottles isn't concentrated.

Per the Dr. Pepper SnApple Group's website, the juice in the large bottles comes from concentrate, with water added to reconstitute it back to original strength.

The 946ml (32 fl oz) bottle holds approximatively 21 lemons worth of juice. If you squeezed 21 fresh lemons, you'd have an equal amount, and they should taste the same.

Because RealLemon contains preservatives, it has a longer shelf life than fresh-squeezed.