I agree with @KikisGirls
I will give you my opinion - I have not used this product. IF your flock is actively laying eggs and you feed a complete (nutritionally balanced) poultry feed that is age appropriate, then supplementation is usually not needed. NOW - a lot depends on what else you give in addition to the poultry feed. We all like to give treats which will dilute the protein and nutritional content of what they eat daily.
You have already purchased the supplement. Durvet is a well known brand, so - in short I don't think it would do any harm, but my biggest concern would be the "electrolyte" in this. Electrolytes is added salt and some type of sugar, for this reason, personally I would not use it daily, but that's me. Once a week for a boost of vitamins would be o.k.
In summer, when electrolytes may be needed, a couple of times a week.
Don't throw them out for sure, since they are in tablet form, they should store well inside the house and you can use it as needed. It never hurts to have something like this on hand.