Can anyone tell me the shelf life of unopened canisters of Ultra Size and Muscle Provider?

Yes! I can help you! We suggest a two year shelf life. They probably are ok to keep even longer if kept in a cool dry place out of the sunlight. ( as in a kitchen cubbard)Make sure to always keep the lids on tight.All batches are made and sent out every 3-4 weeks. We rotate stock faster than anyone. Instead of keeping large numbers in our warehouse for months at at time, we order more frequently. This way your product is always so fresh it's like picking it off the tree and eating it.

Thanks for asking!
Sandy R.