#1 Endurance Supplement - Mimics the Effects of High Altitude Training - Increases Lung Capacity and Oxygen Efficiency, 60 Tablets

At first I did not think this product was doing anything. I ran a half marathon within the first month of starting it, and I did not have a good race. I was also concerned that the pills had oxidized within 2 weeks of opening the bottle and were giving off a strong sulfuric odor. I ordered a new bottle and persevered. I have now been using Altitude boost for 3 months, and I felt fantastic during my last half marathon; I took 3 minutes off of my time and recovered very quickly. Granted, I trained harder for this half, so it may not have all been due to Altitude Boost, but I am not getting any younger and I will take all the help that I can get! I am continuing to take Altitude Boost as I am running a full marathon in a few weeks. Obviously a supplement will not replace hard work but it does appear to be a decent ergogenic aid. I wish it had "Informed Choice" designation. It does say on the bottle that it is drug free and all ingredients are in compliance with WADA, UCI,IOC and NCAA, but for all the competitive athletes out there who may be drug tested, remember that anything that you put in your body is your responsibility, so be aware. I would also advise not to take these on an empty stomach. I have had severe epigastric pain when doing this, so much so that I though I might have gallstones before I figured out it was the Altitude Boost. I never have this problem if I take them after eating.

So I purchased this product with a bit of skepticism based on the claims, but figured I'd give it a shot anyways, as distance running is not something I've ever been good at. I can say without a doubt that this product WORKS! I'm on day number 11 of taking it, and I went from being winded after doing 15 second wind sprints with a two minute recovery, to now being able to do 60 second ones with the same recovery time. Also very apparent is the complete lack of coughing/weezing after 30 minutes of the mentioned workout. I was amazed at how quickly I was able to carry a normal conversation/be able to laugh really hard at something without having a coughing fit. I did no prep workouts prior to the sprints either. I simply took the product everyday as instructed, then on day 9, did the sprints to see if there was any noticeable difference. There definitely was, and I highly recommend this for those of you looking to have better cardio performance.

I waited to give my results due to my first 100 mile run finish. I felt strong all the way through the distance, no muscle fatigue or excessive cardiac output. My only negative about this product is the high price. A lot of potential customers may never get a chance to try this product due to the expense.

I guess this supplement works differently one person to another. I found that it worked 2 weeks or so later. It did give me an extra boost but its no magic pill.

I am highly pleased with the results so far. I'm barely going into week two and I am just surprised at how well it's working for me already. Can't wait to see the results in the coming weeks. I am definitely going to order another bottle. I must say i wasn't expecting a lot because there is only so much a legal supplement can do, but man was I was wrong. I hardly EVER review anything but Altitude Boost deserves it. I hate running and really cardio in general, but this just gives me that boost that gets me going and I find myself not hating cardio anymore. Ive been on a great roll since I started. The lengthy cardio sessions I'm doing with this are going to help me get really shredded this time around. I feel like my fitness and bodybuilding goals are going to a new level entirely. Thanks Altitude Boost for actually doing what the bottle says!! Again its only week two with this, amazing!!

Zero effect

I go to Salt Lake City once a year on business, and since I live at sea level I found I was struggling with being out of breath and the anxiety that comes along with feeling like you can't get enough oxygen. I started to take these a week in advance of my trip this year, and then on through the duration of the trip. I never felt out of breath as I have every year prior (even when exerting myself), so I assume this is what made the difference! These are expensive, so I'll be saving the rest to take starting a week in advance of next years' trip.

It works. I have gone through at least 6 bottles and I notice a significant difference every time I take it. It takes about two week to fully kick in and the effects last about two weeks after I stop taking it. What am I seeing, my running pace drop from a 9:30 to 8:00/8:30 min/mile running at the same perceived effort. I felt it was a little too expensive so I tried to reproduce effects by buying the vitamins and minerals listed on the label separately, B3, B6, B12, C, Iron... at or above the dosage listed and was unable to reproduce the effects at all. I'm guessing that either they use a purer grade of materials or they are not listing all the ingredients. Whatever, it works! Just cost too much!