I had no issues with the Altitude Advantage. It did not upset my stomach. I went to Wyoming from Texas for a 7 day backpacking course spending most of my time around 10,500 feet of elevation. I normally have a day or two of being winded and evenings sometimes I can have difficulty breathing when going to bed. I had zero issues the whole time. I wasn't able to train like normal for the elevation due to a knee injury so I was grateful for the supplements as it seemed they helped.

Can’t live without it!

Living in the Midwest, this product is an absolute must when I travel west for mountain hunts. I’ve done the hunts with and without and there is a very noticeable difference! I won’t go to the mountains without this in my pack!

Prep

Great product to get ready to go into altitude... Makes the transition easier for me ...