While doing online research to find a quality probiotic I came across a website named [...] evaluates nutritional products based on 1. Label Accuracy 2. Product Purity 3. Nutritional Value 4. Ingredient Safety 5. Projected Efficiency. Now Probiotic-10 25 Billion received an A grade and ranked third out of 10 reviews. Here's a link to the report [...] . Being an Amazon Prime member, I went to Amazon.com to find the price of Now Probiotic-10 25 Billion to cost approx. 1/3 the price of the 1st and 2nd rated products on the Labdoor website. Only wanting to take one capsule per day instead of two, I elected to purchase the 50 Billion. And to get the best price, I purchased the three bottle package.Having already made my decision to purchase Now Pro-10 50 Bil. due to Labdoor's review, which was based on tests under controlled conditions, after ordering, I was curious to read why someone would rate it a one star on Amazon reviews. Most of them were based on heat and not delivered on ice. My response to them any anyone that believes them is, the information I have collected throughout all my research on probiotics says heat doesn't kill the viable bacteria in a short amount of time, especially the time it takes from the shipper to the point of delivery. Secondly, the delivery charge to have it delivered that way would cost three to five times more than the product cost.However, having spent $65.00 on them and not knowing how long they may have been warehoused and not wanting to wait until I opened each individual bottle to test them, I elected to test a capsule from each of the three bottles immediately after opening the package and before refrigerating them. Especially since Amazon has such an amazingly excellent return policy if requested in a timely manner, and since it was going to take my wife and I 45 days to consume all 150 capsules of them. With that being said, I poured 2 ounces of 2% refrigerated milk into three separate petri dishes, separated the ends of each capsule and emptied the contents of each capsule into it's own dish of milk, stiring the mixture until there was no more powder floating on the surface of the milk. I numbered each bottle with a 1, 2, or 3, and placed the bottle number on each dish representing the bottle the capsule came from in case I got different results in each dish. Knowing it would take between 24-48 hours at room temperature for the milk to curdle, indicating that the bacteria was alive and active, I left it on the kitchen counter over night. Having started the test at 4 pm, I checked the mixtures the following morning at 8 am to find a slight film on the surface of the milk, but the milk still in a mostly liquid state. Nothing I would consider a curdle. At 6 pm that evening, the petri dishes could be held upside down without any of the contents exiting it. Upon pushing gently on the substance, I could feel a texture similar to that of soft butter/margarine at refrigerated temperature. (26 hours after mixing the contents into the milk.) Exactly the results I was expecting from a fresh quality probiotic. And as a note, the package was delivered by my mail carrier, placed in my mailbox that was exposed to direct sunlight from 10 am when it was delivered, until removed at 3 pm. (5-hours) At the cost of .29 cents per capsule vs 80-90 cents for the two probiotics rated minutely better, Now Pro-10 50 Billion wins hands down in my book and I don't mind spending 31 cent per bottle to test them. (Including the milk)If you don't believe me, click the Labdoor link above.