To calculate the overall star rating and percentage breakdown by star, we do not use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
Each bottle is individually packed, show the effort and care Amazon had put in. One of the bottle had its safety button moved, it also leaked thru the cap, indicate the food had gone bad. I won't be bothered to file a return as i think out of dozen bottles I bought from Amazon, one or a few is/are gonna go bad. Due to the individually packed bottle, it didn't cause a mess or affect the other items.