There's 30% less oxygen in Vail than at sea level. Vail sits at just above 8,000 feet in the valley and 11,570 at the highest peak. Altitude can affect anyone and can be different every trip to the high country. Here's some information on Oxygen serv...
This increases your red blood cells which increases oxygenation. We use it and know many others who do with no side effects but always consult your doctor with new supplements.
Chloroxygen® Chlorophyll Softgels, 60-Count
Freedom to eat carbs! (For real!)
Foods To Eat At Altitude
An inexpensive pulse oximeter from any pharmacy can give you readings of your oxygenation level. Pulmonologists in the high country recommend nothing under 88. If it's under 88 you should seek supplemental oxygen.