My cat is scheduled for surgery on Dec. 6th and his wbc's are consistantly in the low-normal range. I'm looking into boosting his immune system prior to surgery with Transfer Factor. 4Life makes it, but it is much more expensive than the Source Naturals Wellness Transfer Factor. Is this a case of "you get what you pay for" or is 4Life just over-priced bc. they spend a lot on advertising and obtaining testimonials, etc. Any thoughts?