100% lime juice made with real limes. Tastes great, and just like youd expect it to be! Which in my opinion is just like the real thing but without the mess. The only time I buy actual limes is if I need the zest for something. What I like even more though, is the size of this bottle. I don't use it daily, so often I have found myself questioning whether a larger bottle in my fridge is still fresh/good, and have often thrown it away almost full because it sat in my fridge for so long. I feel better knowing I have less waste with this smaller size bottle.