Response on November 9, 2009 to an Internet inquiry:

Thank you for your interest in Optimum Nutrition products.  The
following products are those to avoid; those which absolutely contain
gluten:

 

100% Whey Gold Standard-Cookies n' Cream (cookie pieces)

100% Casein Gold Standard (cookie pieces)

Serious Mass-all flavors(glutamine peptides)

Aftermax-all flavors (glutamine peptides)

Pro Complex-all flavors (glutamine peptides)

Pro Complex Gainer-all flavors (glutamine peptides)

Nitro-Core 24 - all flavors (glutamine peptides)

Lift Bar - Cookies & Cream (glutamine peptides)

Mor'sos-Cookies and Cream (cookie pieces) - Discontinued

 

*To the best of our knowledge these are the only products that contain
gluten.  While we are not adding gluten to our other products, we cannot
say with 100% certainty that our other products are gluten-free.  We use
the same equipment to make products with and without gluten.  Although
the equipment is cleaned in-between, trace amounts of gluten may remain.

 

I hope this helps you out--Best of health

Rebecca Johnsen
Consumer Affairs Rep
Optimum Nutrition/American Body Building
1-800-705-5226