Hammer Nutrition makes gluten free products including whey and soy protein powders. They make products for endurance sports, too. I've been using them while I trained for a century bike ride and during the ride. I haven't tried the protein powders yet. I have used the J Robb whey protein with good results, it is gluten-free.
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This is a very interesting question and I tend to agree with some of the answers - during strenuous exercise while you are malnourished your body cannot handle the exertion. I was diagnosed after I had begun bicycle training. I was seeing stars and feeling faint while biking and, finally, all day long. I discovered that I was severely anemic. We eventually...
I use Micronized CM 750 Creatine Caps from AST Sports Science. www.ast-ss.com. I buy it from Lame Advertisement.
I haven't had any problems with it - related to gluten. I felt I needed some help building my muscles after getting so malnourished and weak before i was diagnosed with celiac disease.