How long to keep kefir?

[dixie_74]

I bought a quart of Helios kefir around 3 weeks ago. I envisioned drinking it and making smoothies. In reality I took a couple sips and put it in the back of my fridge. I was going to toss it today but noticed the date on the container says 10/26. So... is this still usuable?

I began thinking that this is a fermented product, what is it going to do, spoil? So how do you determine if it is usable?

I would really like to feel reassured giving this to my children in smoothies and such.

Can you give me some more ideas to incorporate this into our diet on a more regular basis?

Help???

[saratc]

I keep my homemade kefir in my fridge for a ridiculous amount of time. I've also consumed store bought yogurt very well past the due date with no issues. I would guess it's perfectly fine.