I was skeptical at first when I saw this, but after having took the Immunocal for a month now, I can say, I'm a believer! My energy has soared. My knees don't crack everytime I bend down! My recovery time after working out is amazing. My cardio routeine has become longer and easier. My entire family has been sick, except for me-which means I'll have to order it for them too. In general, I love this stuff. The F.I.T.T. chocolate supplement is great tasting, not like others I've tried. People have asked me "whats different with you?" All I can say is 'Immunocal'. Thank you Immunotec, and Tanya!