Thank you for reaching out regarding our insect repellent herbal wipe-on oil product. We have had a couple of customers ask about the expiration date.
When it comes to our insect repellent products we do recommend using up the product within 2 years of purchase. It does not technically go bad, but over time the plant and flower oils that make up this formula will change scent.
This products as well as our insect repellent spray work like a body spray or perfume to help to camouflage the animal confuse the insects. Think of it like a hunter going into the woods and does not want to smell like a human.
We personally have used older products with success, but find the fresher the batch and more fragrant the better at disguising the animal from the insects.
Hope this helps you and others answer this question.