CLA is a fatty acid i think and is used in slimming and also acts to suppress the appetite a bit too.
L-Gluatamine is an amino acid and supplementing with this is said to increase the efficiency of your immune system and increase the release of hgh. There are also claims that it can prevent heart disease.. http://www.ncbi.nlm.nih.gov/entrez/quer ... t=Abstract
To a racing cyclist, i think only the glutamine would be of benefit in terms of the immunity it provides, however, i think immunity could be increased more effectively by simply taking a multivit and perhaps extra vitamin c.
Just my view and I'd like to hear the view of others