I bought a bottle and split it with a buddy before we went on an archery elk hunt. In Pa we live at about 1300 feet, we planned to start our hunt at about 10,200. I started taking my share about 10 days before the hunt. He didn’t want to take his. I know peoples bodies adapt differently, but when we pulled in to the trail head after a 24 hour drive, I was ready to go. No issues whatsoever. Didn’t feel sick, didn't feel groggy, no headache, NOTHING… him on the other hand, not so well. Literally within about 10 minutes of being out of the truck he had a headache, felt sick, eyes bloodshot, had to clear out the backseat so he could lay down. While I was picking a spot to put up a tent for the night, he was in bad shape in the truck. Eventually he had to abort our first evening. He ended up buying us a hotel room in the closest town and spent the evening in bed to get his body adapted.
I’m not saying he would have gotten sick either way, but the way I felt compared to him was night and day. I’m a firm believer in Altitude Advantage!
Try it!